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Lexicographic order

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2980: 1962: 4441: 36: 1468: 546:, a slightly different variant of the lexicographical order is used: the parts on the left of the decimal point are compared as before; if they are equal, the parts at the right of the decimal point are compared with the lexicographical order. The padding 'blank' in this context is a trailing "0" digit. 3854: 3858:
For this ordering, the monomials of degree one have the same order as the corresponding indeterminates (this would not be the case if the reverse lexicographical order would be used). For comparing monomials in two variables of the same total degree, this order is the same as the lexicographic
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In lexicographical order, the word "Thomas" appears before "Thompson" because they first differ at the fifth letter ('a' and 'p'), and letter 'a' comes before the letter 'p' in the alphabet. Because it is the first difference, in this case the 5th letter is the "most significant difference" for
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if the monoid operation is denoted multiplicatively. This compatibility implies that the product of a polynomial by a monomial does not change the order of the terms. For Gröbner bases, a further condition must be satisfied, namely that every non-constant monomial is greater than the monomial
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is a variant of the lexicographical order that is obtained by reading finite sequences from the right to the left instead of reading them from the left to the right. More precisely, whereas the lexicographical order between two sequences is defined by
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In general, the difference between the colexicographical order and the lexicographical order is not very significant. However, when considering increasing sequences, typically for coding subsets, the two orders differ significantly.
884: 3531:, and then resolving the conflicts by using the lexicographical order. This order is not widely used, as either the lexicographical order or the degree reverse lexicographical order have generally better properties. 2511: 190:
There are several variants and generalizations of the lexicographical ordering. One variant applies to sequences of different lengths by comparing the lengths of the sequences before considering their elements.
535:, and a natural number is larger than another one if either it has more digits (ignoring leading zeroes) or the number of digits is the same and the first (most significant) digit which differs is larger. 3707: 245:, that depends on the underlying ordering of the alphabet of symbols used to build the words. The lexicographical order is one way of formalizing word order given the order of the underlying symbols. 568:
standard for dates, which expresses a date as YYYY-MM-DD. This formatting scheme has the advantage that the lexicographical order on sequences of characters that represent dates coincides with the
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consists also in comparing first the total degrees, and, in case of equality of the total degrees, using the reverse of the colexicographical order. That is, given two exponent vectors, one has
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numbered in colexicographical order, and starting from 0. The lexicographical (lex) and colexicographical (colex) orders are on the top and the corresponding reverse orders (rev) on the bottom
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As evaluating the lexicographical order of sequences compares only elements which have the same rank in the sequences, the lexicographical order extends to Cartesian products of ordered sets.
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order. This is not the case with more variables. For example, for exponent vectors of monomials of degree two in three variables, one has for the degree reverse lexicographic order:
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is equivalent to convert it into an increasing sequence. The lexicographic order on the resulting sequences induces thus an order on the subsets, which is also called the
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If two words have different lengths, the usual lexicographical order pads the shorter one with "blanks" (a special symbol that is treated as smaller than every element of
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When negative numbers are also considered, one has to reverse the order for comparing negative numbers. This is not usually a problem for humans, but it may be for
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One of these admissible orders is the lexicographical order. It is, historically, the first to have been used for defining Gröbner bases, and is sometimes called
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Unlike the finite case, an infinite product of well-orders is not necessarily well-ordered by the lexicographical order. For instance, the set of
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One can define similarly the lexicographic order on the Cartesian product of an infinite family of ordered sets, if the family is indexed by the
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is a multiple of the least indeterminate if and only if its leading monomial (its greater monomial) is a multiple of this least indeterminate.
2673:(it may be also injective if the forms are dependent, see below). The lexicographic order on the image of this map induces a group order on 1531:, or more generally by a well-ordered set. This generalized lexicographical order is a total order if each factor set is totally ordered. 500:
finite words is well-ordered; for example, the infinite set of words {b, ab, aab, aaab, ... } has no lexicographically earliest element.
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One passes from an order to its reverse order, either by reading bottom-up instead of up-bottom, or by exchanging red and white colors.
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Since many applications require well orders, a variant of the lexicographical orders is often used. This well-order, sometimes called
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natural numbers. This is not the case for the lexicographical order, as, with the lexicographical order, we have, for example,
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For example, for ordering the increasing sequences (or the sets) of two natural integers, the lexicographical order begins by
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of ordered sets, which is a total order when all these sets are themselves totally ordered. An element of a Cartesian product
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As Gröbner bases are defined for polynomials in a fixed number of variables, it is common to identify monomials (for example
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For example, using the natural order of the integers, the lexicographical ordering on the subsets of three elements of
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by the lexicographical order (provided the alphabet is finite); that is, every decreasing sequence of words of length
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with no symbols at all. The lexicographical order on the set of all these finite words orders the words as follows:
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of the lexicographic order. In fact, with positional notation, a natural number is represented by a sequence of
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12 < 13 < 14 < 15 < ... < 23 < 24 < 25 < ... < 34 < 35 < ... < 45 < ...
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is that it is not always immediately obvious which of two numbers is the smaller. On the other hand, with the
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is finite. In other words, the colexicographical order for increasing sequences of a given length induces an
3345: 1516:, then the result is a total order as well. The lexicographical order of two totally ordered sets is thus a 4222: 3541: 3224:
The main property of the colexicographical order for increasing sequences of a given length is that every
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is finite (or equivalently, every non-empty subset has a least element). It is not true that the set of
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With this terminology, the above definition of the lexicographical order becomes more concise: Given a
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The lexicographical order is used not only in dictionaries, but also commonly for numbers and dates.
141: 1847: 4200: 3263: 3258:, the order of the terms does not matter in general, as the addition is commutative. However, some 674: 27:
Generalization of the alphabetical order of dictionaries to sequences of elements of an ordered set
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with the natural numbers, and allows enumerating these sequences. This is frequently used in
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for distinguishing it from other orders that are also related to a lexicographical order.
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123 < 124 < 125 < 126 < 134 < 135 < 136 < 145 < 146 < 156 <
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under lexicographical order, if at least one of the following conditions is satisfied:
610:(including the empty sequence, of length 0), and the operation (multiplication) is the 172: 137: 133: 604:. That is, the elements of the monoid are the finite sequences (words) of elements of 4358: 4314: 4286: 3229: 2939:
is an order isomorphism when the image is equipped with the lexicographical order on
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234 < 235 < 236 < 245 < 246 < 256 < 345 < 346 < 356 < 456
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12 < 13 < 23 < 14 < 24 < 34 < 15 < 25 < 35 < 45 < ...
2015: 1693: 1517: 1108:), and, if the lengths are equal, using the lexicographical order. If the order on 564:
Another example of a non-dictionary use of lexicographical ordering appears in the
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The lexicographical ordering may also be used to characterize all group orders on
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They can thus be ordered by the lexicographical order, and for two such functions
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represented as sets of red squares, increasing sequences (in blue), or by their
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the lexicographical order is thus determined by their values for the smallest
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binary sequences (by definition, the set of functions from natural numbers to
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is the number of variables, every monomial order is thus the restriction to
553:(testing the sign takes some time). This is one of the reasons for adopting 4247: 3528: 1639:) does not have a least element under the lexicographical order induced by 1574: 238: 176: 2705:
Robbiano's theorem is that every group order may be obtained in this way.
879:{\displaystyle \varepsilon <b\,\,{\text{ for all }}b\neq \varepsilon ,} 206:
by assigning a total order to the finite set, and converting subsets into
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A useful property of the degree reverse lexicographical order is that a
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For the lexicographical order, the same exponent vectors are ordered as
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is finite, then the resulting order is a well-order. As shown above, if
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where the two words differ (counting from the beginning of the words):
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Weispfenning, Volker (May 1987), "Admissible Orders and Linear Forms",
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of dates easier by avoiding the need for a separate sorting algorithm.
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An important property of the lexicographical order is that for each
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In this context, one generally prefer to sort first the subsets by
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Robbiano, L. (1985). Term orderings on the polynomial ring. In
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linear forms with real coefficients, such that the induced map
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For similarly named ordering systems outside mathematics, see
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Notice that, due to the prefix condition in this definition,
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are finite, and thus the colexicographical order defines an
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For ordering finite subsets of a given cardinality of the
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is a well-order, the same is true for the shortlex order.
523:, comparing numbers is easy, because the natural order on 4308: 2069:, one has often to enumerate, and therefore to order the 694:); care must be taken if these cases are to be excluded. 4223:
Lexicographic ordering in tensor abstract index notation
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order (see below) is often more convenient, because all
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of ordered symbols or, more generally, of elements of a
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Orders on the Cartesian product of totally ordered sets
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Orderings of the 24 permutations of {1,...,5} that are
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Information and randomness. An algorithmic perspective
4208:- an application of lexicographic order in economics. 4025: 3865: 3715: 3634: 3544: 3491: 3459: 3430: 3357: 3296: 2945: 2925: 2896: 2873: 2841: 2812: 2792: 2772: 2746: 2714: 2679: 2643: 2614: 2587: 2555: 2521: 2462: 2429: 2401: 2378: 2345: 2312: 2283: 2263: 2167: 2129: 2102: 2079: 2024: 1975: 1939: 1919: 1899: 1850: 1830: 1807: 1787: 1764: 1744: 1724: 1701: 1645: 1621: 1582: 1544: 1498: 1478: 1332: 1306: 1278: 1258: 1229: 1202: 1182: 1136: 1088: 987: 960: 937: 915: 892: 847: 677: 652: 328: 1687: 2257:between the natural numbers and the set of sets of 1042:has no least element in the lexicographical order: 954:then so is the lexicographic order on the words of 60:. Unsourced material may be challenged and removed. 4304: 4302: 4172: 4009: 3848: 3701: 3620: 3509: 3474: 3445: 3410: 3331: 2963: 2931: 2911: 2879: 2856: 2827: 2798: 2778: 2758: 2732: 2697: 2661: 2629: 2593: 2573: 2539: 2505: 2444: 2407: 2387: 2360: 2324: 2298: 2269: 2215: 2135: 2111: 2088: 2051: 2002: 1945: 1925: 1905: 1883: 1836: 1816: 1793: 1773: 1750: 1730: 1707: 1660: 1627: 1607: 1565: 1504: 1484: 1462: 1318: 1287: 1264: 1238: 1215: 1188: 1168: 1100: 993: 969: 946: 923: 898: 878: 686: 658: 346:Given two different words of the same length, say 334: 210:, to which the lexicographical order is applied. 3332:{\displaystyle a<b{\text{ implies }}ac<bc,} 2515:The lexicographical ordering is a group order on 1682:011111... < 101111... < 110111 ... < ... 1122:The lexicographical order defines an order on an 4453: 1670:100000... > 010000... > 001000... > ... 4299: 4280: 4218:Lexicographic order topology on the unit square 1169:{\displaystyle E_{1}\times \cdots \times E_{n}} 4313:. Cambridge University Press. pp. 18–19. 2456:, which is compatible with addition, that is 1298:lexicographical order on the Cartesian product 4250:, a different way of combining partial orders 4398: 4349:Monographs on Theoretical Computer Science. 3527:Another one consists in comparing first the 3411:{\displaystyle x_{1}x_{2}^{3}x_{4}x_{5}^{2}} 2210: 2174: 2043: 2025: 1994: 1976: 1738:may be identified with sequences indexed by 1596: 1583: 1557: 1545: 503: 4389:(pp. 513-517). Springer Berlin Heidelberg. 4276: 4274: 3418:) with their exponent vectors (here ). If 3105:the colexicographical order is defined by 2096:For this, one usually chooses an order on 4412: 4228:Lexicographically minimal string rotation 3494: 3462: 3433: 2948: 2899: 2844: 2815: 2717: 2682: 2646: 2617: 2558: 2524: 2432: 2348: 920: 916: 858: 857: 316:are the finite sequences of symbols from 120:Learn how and when to remove this message 3274:, concept that requires the choice of a 3213:and the colexicographic order begins by 2978: 2974: 1960: 1637:{ 100000..., 010000..., 001000..., ... } 438:in the underlying order of the alphabet 213:A generalization defines an order on an 4446:Lexicographic and colexicographic order 4387:European Conference on Computer Algebra 4271: 2708:More precisely, given a group order on 14: 4454: 4333: 646:. By this definition, the empty word ( 4173:{\displaystyle <<<<<.} 2334: 1117: 283:that are not the same symbol, either 4407:(2), New York, NY, USA: ACM: 16–18, 4309:Franz Baader; Tobias Nipkow (1999). 4010:{\displaystyle <<<<<} 3536:degree reverse lexicographical order 3483: 2669:which is injective if the forms are 58:adding citations to reliable sources 29: 24: 3236:, for example in the proof of the 1953:is infinite this is not the case. 1472:The result is a partial order. If 1447: 1426: 1400: 1374: 1361: 1001:is well-ordered. For instance, if 977:However, in general this is not a 624:(or 'truncation') of another word 579: 25: 4478: 4433: 3510:{\displaystyle \mathbb {Z} ^{n},} 2964:{\displaystyle \mathbb {R} ^{s}.} 2733:{\displaystyle \mathbb {Z} ^{n},} 2698:{\displaystyle \mathbb {Z} ^{n}.} 2662:{\displaystyle \mathbb {R} ^{n},} 2574:{\displaystyle \mathbb {Z} ^{n}.} 2540:{\displaystyle \mathbb {Z} ^{n}.} 2216:{\displaystyle S=\{1,2,3,4,5,6\}} 1956: 1688:Functions over a well-ordered set 1608:{\displaystyle \{0,1\}^{\omega }} 4439: 3475:{\displaystyle \mathbb {Z} ^{n}} 3446:{\displaystyle \mathbb {N} ^{n}} 2912:{\displaystyle \mathbb {Z} ^{n}} 2857:{\displaystyle \mathbb {R} ^{s}} 2828:{\displaystyle \mathbb {Z} ^{n}} 2630:{\displaystyle \mathbb {Z} ^{n}} 2608:coefficients, define a map from 2445:{\displaystyle \mathbb {Z} ^{n}} 2395:whose elements are sequences of 2361:{\displaystyle \mathbb {Z} ^{n}} 2052:{\displaystyle \{1,\ldots ,6\},} 2003:{\displaystyle \{1,\ldots ,6\},} 1684:is an infinite ascending chain. 557:representation for representing 248:The formal notion starts with a 194:Another variant, widely used in 34: 3783: 3777: 3290:. Here "compatible" means that 3282:, which is compatible with the 2890:the resulting isomorphism from 2478: 2472: 2415:integers, and operation is the 265:. That is, for any two symbols 45:needs additional citations for 4444:Learning materials related to 4392: 4379: 4327: 4164: 4146: 4140: 4122: 4116: 4098: 4092: 4074: 4068: 4050: 4044: 4026: 4004: 3986: 3980: 3962: 3956: 3938: 3932: 3914: 3908: 3890: 3884: 3866: 3615: 3583: 3577: 3545: 2864:has the following properties; 1884:{\displaystyle f(x)\neq g(x).} 1875: 1869: 1860: 1854: 1345: 1333: 780:(possibly empty) and elements 13: 1: 4264: 687:{\displaystyle =\varepsilon } 480:, the set of words of length 228: 171:) is a generalization of the 4285:. Springer. pp. 88–89. 3243: 2991:(in red) of permutations in 899:{\displaystyle \varepsilon } 659:{\displaystyle \varepsilon } 511:One of the drawbacks of the 335:{\displaystyle \varepsilon } 7: 4311:Term Rewriting and All That 4189: 3809: for the largest  1068:quasi-lexicographical order 735:is non-empty, then one has 527:is the same as the variant 521:Hindu–Arabic numeral system 10: 4483: 4212:Lexicographic optimization 3522:pure lexicographical order 3247: 2475: if and only if  2299:{\displaystyle 12n<134} 1386: if and only if  131: 4206:Lexicographic preferences 1913:is also well-ordered and 1674:infinite descending chain 1319:{\displaystyle A\times B} 504:Numeral systems and dates 142:lexicographic preferences 4281:Egbert Harzheim (2006). 3268:multivariate polynomials 3264:polynomial long division 2932:{\displaystyle \varphi } 2880:{\displaystyle \varphi } 2799:{\displaystyle \varphi } 1566:{\displaystyle \{0,1\},} 1249:Specifically, given two 924:{\displaystyle \,<\,} 18:Lexicographical ordering 3517:for a classification). 3453:of a monomial order of 2759:{\displaystyle s\leq n} 2740:there exist an integer 2325:{\displaystyle n>2.} 1661:{\displaystyle 0<1,} 981:, even if the alphabet 630:if there exists a word 471:alphabetical ordering. 4184:homogeneous polynomial 4174: 4011: 3850: 3703: 3622: 3511: 3484:§ Group orders of 3476: 3447: 3412: 3333: 3238:Kruskal–Katona theorem 3000: 2999:order, and vice versa. 2965: 2933: 2913: 2881: 2858: 2829: 2800: 2780: 2760: 2734: 2699: 2663: 2631: 2595: 2575: 2541: 2507: 2446: 2409: 2389: 2362: 2326: 2300: 2271: 2217: 2137: 2113: 2090: 2062: 2053: 2004: 1947: 1927: 1907: 1885: 1838: 1818: 1795: 1775: 1752: 1732: 1709: 1662: 1629: 1609: 1567: 1506: 1486: 1464: 1320: 1289: 1266: 1251:partially ordered sets 1240: 1217: 1190: 1170: 1102: 1101:{\displaystyle a<b} 995: 971: 948: 925: 900: 880: 688: 660: 336: 223:partially ordered sets 4175: 4012: 3851: 3817: for which  3704: 3623: 3512: 3477: 3448: 3413: 3334: 2982: 2975:Colexicographic order 2966: 2934: 2914: 2882: 2859: 2830: 2801: 2781: 2761: 2735: 2700: 2664: 2632: 2596: 2576: 2542: 2508: 2447: 2410: 2390: 2363: 2327: 2301: 2272: 2218: 2145:lexicographical order 2138: 2114: 2091: 2054: 2005: 1964: 1948: 1928: 1908: 1886: 1839: 1819: 1796: 1776: 1753: 1733: 1710: 1692:The functions from a 1663: 1630: 1610: 1568: 1507: 1487: 1465: 1321: 1290: 1267: 1241: 1218: 1216:{\displaystyle E_{i}} 1191: 1171: 1103: 996: 972: 949: 926: 901: 881: 689: 661: 337: 161:lexicographical order 69:"Lexicographic order" 4238:Long line (topology) 4201:Kleene–Brouwer order 4023: 3863: 3713: 3632: 3621:{\displaystyle <} 3542: 3489: 3457: 3428: 3355: 3294: 2943: 2923: 2894: 2871: 2839: 2810: 2790: 2770: 2744: 2712: 2677: 2671:linearly independent 2641: 2612: 2585: 2553: 2519: 2460: 2427: 2399: 2376: 2343: 2310: 2281: 2261: 2165: 2127: 2100: 2077: 2022: 1973: 1937: 1917: 1897: 1848: 1828: 1805: 1785: 1762: 1742: 1722: 1699: 1643: 1619: 1580: 1542: 1496: 1476: 1330: 1304: 1276: 1256: 1227: 1200: 1180: 1176:is a sequence whose 1134: 1086: 985: 958: 935: 931:is a total order on 913: 890: 845: 675: 650: 574:computerized sorting 513:Roman numeral system 326: 208:increasing sequences 54:improve this article 4414:10.1145/24554.24557 3407: 3382: 3308: implies  2012:indicator functions 1965:Orderings of the 3- 1717:totally ordered set 1196:element belongs to 906:is the empty word. 861: for all  762:there exists words 570:chronological order 517:positional notation 257:, often called the 185:totally ordered set 4170: 4007: 3846: 3699: 3618: 3507: 3472: 3443: 3408: 3393: 3368: 3329: 3001: 2961: 2929: 2909: 2877: 2854: 2825: 2796: 2776: 2756: 2730: 2695: 2659: 2627: 2591: 2571: 2537: 2503: 2442: 2405: 2388:{\displaystyle n,} 2385: 2370:free Abelian group 2358: 2322: 2296: 2267: 2213: 2133: 2112:{\displaystyle S.} 2109: 2089:{\displaystyle S.} 2086: 2063: 2049: 2000: 1943: 1923: 1903: 1881: 1834: 1817:{\displaystyle g,} 1814: 1791: 1774:{\displaystyle Y.} 1771: 1748: 1728: 1705: 1658: 1625: 1605: 1573:also known as the 1563: 1536:countably infinite 1502: 1482: 1460: 1316: 1288:{\displaystyle B,} 1285: 1262: 1239:{\displaystyle i.} 1236: 1213: 1186: 1166: 1118:Cartesian products 1098: 991: 970:{\displaystyle A.} 967: 947:{\displaystyle A,} 944: 921: 896: 876: 684: 656: 332: 173:alphabetical order 138:natural sort order 134:alphabetical order 4320:978-0-521-77920-3 4292:978-0-387-24222-4 3818: 3810: 3781: 3309: 3286:structure of the 3270:are related with 3254:When considering 3230:order isomorphism 2989:inversion vectors 2779:{\displaystyle s} 2594:{\displaystyle n} 2476: 2408:{\displaystyle n} 2335:Group orders of Z 2270:{\displaystyle n} 2255:order isomorphism 2247:colexicographical 2154:, such as in the 2136:{\displaystyle S} 1946:{\displaystyle X} 1926:{\displaystyle X} 1906:{\displaystyle Y} 1837:{\displaystyle x} 1794:{\displaystyle f} 1751:{\displaystyle X} 1731:{\displaystyle Y} 1708:{\displaystyle X} 1628:{\displaystyle 1} 1505:{\displaystyle B} 1485:{\displaystyle A} 1434: 1408: 1387: 1265:{\displaystyle A} 1189:{\displaystyle i} 1128:Cartesian product 994:{\displaystyle A} 862: 614:of words. A word 588:over an alphabet 219:Cartesian product 130: 129: 122: 104: 16:(Redirected from 4474: 4443: 4427: 4425: 4416: 4396: 4390: 4383: 4377: 4376: 4344: 4335:Calude, Cristian 4331: 4325: 4324: 4306: 4297: 4296: 4278: 4179: 4177: 4176: 4171: 4016: 4014: 4013: 4008: 3855: 3853: 3852: 3847: 3842: 3841: 3829: 3828: 3819: 3816: 3811: 3808: 3806: 3805: 3793: 3792: 3782: 3779: 3776: 3775: 3757: 3756: 3744: 3743: 3725: 3724: 3708: 3706: 3705: 3700: 3695: 3694: 3676: 3675: 3663: 3662: 3644: 3643: 3627: 3625: 3624: 3619: 3614: 3613: 3595: 3594: 3576: 3575: 3557: 3556: 3516: 3514: 3513: 3508: 3503: 3502: 3497: 3481: 3479: 3478: 3473: 3471: 3470: 3465: 3452: 3450: 3449: 3444: 3442: 3441: 3436: 3423: 3417: 3415: 3414: 3409: 3406: 3401: 3392: 3391: 3381: 3376: 3367: 3366: 3343: 3338: 3336: 3335: 3330: 3310: 3307: 3219: 3208: 3193: 3184: 3175: 3169: 3153: 3100: 3091: 3082: 3076: 3060: 2970: 2968: 2967: 2962: 2957: 2956: 2951: 2938: 2936: 2935: 2930: 2919:to the image of 2918: 2916: 2915: 2910: 2908: 2907: 2902: 2886: 2884: 2883: 2878: 2863: 2861: 2860: 2855: 2853: 2852: 2847: 2834: 2832: 2831: 2826: 2824: 2823: 2818: 2805: 2803: 2802: 2797: 2785: 2783: 2782: 2777: 2765: 2763: 2762: 2757: 2739: 2737: 2736: 2731: 2726: 2725: 2720: 2704: 2702: 2701: 2696: 2691: 2690: 2685: 2668: 2666: 2665: 2660: 2655: 2654: 2649: 2636: 2634: 2633: 2628: 2626: 2625: 2620: 2600: 2598: 2597: 2592: 2580: 2578: 2577: 2572: 2567: 2566: 2561: 2546: 2544: 2543: 2538: 2533: 2532: 2527: 2512: 2510: 2509: 2504: 2477: 2474: 2451: 2449: 2448: 2443: 2441: 2440: 2435: 2414: 2412: 2411: 2406: 2394: 2392: 2391: 2386: 2367: 2365: 2364: 2359: 2357: 2356: 2351: 2331: 2329: 2328: 2323: 2305: 2303: 2302: 2297: 2276: 2274: 2273: 2268: 2251:initial segments 2234: 2229: 2222: 2220: 2219: 2214: 2142: 2140: 2139: 2134: 2118: 2116: 2115: 2110: 2095: 2093: 2092: 2087: 2058: 2056: 2055: 2050: 2016:decimal notation 2009: 2007: 2006: 2001: 1952: 1950: 1949: 1944: 1932: 1930: 1929: 1924: 1912: 1910: 1909: 1904: 1890: 1888: 1887: 1882: 1843: 1841: 1840: 1835: 1823: 1821: 1820: 1815: 1800: 1798: 1797: 1792: 1780: 1778: 1777: 1772: 1757: 1755: 1754: 1749: 1737: 1735: 1734: 1729: 1714: 1712: 1711: 1706: 1694:well-ordered set 1683: 1671: 1667: 1665: 1664: 1659: 1638: 1634: 1632: 1631: 1626: 1614: 1612: 1611: 1606: 1604: 1603: 1572: 1570: 1569: 1564: 1518:linear extension 1511: 1509: 1508: 1503: 1491: 1489: 1488: 1483: 1469: 1467: 1466: 1461: 1456: 1452: 1451: 1450: 1435: 1432: 1430: 1429: 1409: 1406: 1404: 1403: 1388: 1385: 1383: 1379: 1378: 1377: 1365: 1364: 1325: 1323: 1322: 1317: 1300: 1299: 1294: 1292: 1291: 1286: 1271: 1269: 1268: 1263: 1245: 1243: 1242: 1237: 1222: 1220: 1219: 1214: 1212: 1211: 1195: 1193: 1192: 1187: 1175: 1173: 1172: 1167: 1165: 1164: 1146: 1145: 1113: 1107: 1105: 1104: 1099: 1081: 1056: 1041: 1015: 1000: 998: 997: 992: 976: 974: 973: 968: 953: 951: 950: 945: 930: 928: 927: 922: 905: 903: 902: 897: 885: 883: 882: 877: 863: 860: 835: 824: 813: 797: 791: 785: 779: 773: 767: 759: 753: 744: 734: 728: 722: 716: 711:, and two words 710: 693: 691: 690: 685: 671: 665: 663: 662: 657: 645: 635: 629: 619: 609: 603: 593: 555:two's complement 544:decimal notation 533:numerical digits 495: 485: 479: 452: 443: 437: 417: 407: 401: 373: 341: 339: 338: 333: 321: 315: 302: 292: 282: 276: 270: 256: 169:dictionary order 125: 118: 114: 111: 105: 103: 62: 38: 30: 21: 4482: 4481: 4477: 4476: 4475: 4473: 4472: 4471: 4452: 4451: 4436: 4431: 4430: 4401:SIGSAM Bulletin 4397: 4393: 4384: 4380: 4365: 4351:Springer-Verlag 4332: 4328: 4321: 4307: 4300: 4293: 4279: 4272: 4267: 4192: 4024: 4021: 4020: 3864: 3861: 3860: 3837: 3833: 3824: 3820: 3815: 3807: 3801: 3797: 3788: 3784: 3780: and  3778: 3771: 3767: 3752: 3748: 3739: 3735: 3720: 3716: 3714: 3711: 3710: 3690: 3686: 3671: 3667: 3658: 3654: 3639: 3635: 3633: 3630: 3629: 3609: 3605: 3590: 3586: 3571: 3567: 3552: 3548: 3543: 3540: 3539: 3498: 3493: 3492: 3490: 3487: 3486: 3466: 3461: 3460: 3458: 3455: 3454: 3437: 3432: 3431: 3429: 3426: 3425: 3419: 3402: 3397: 3387: 3383: 3377: 3372: 3362: 3358: 3356: 3353: 3352: 3341: 3306: 3295: 3292: 3291: 3252: 3246: 3226:initial segment 3217: 3206: 3191: 3186: 3182: 3177: 3171: 3167: 3160: 3155: 3152: 3143: 3137: 3130: 3121: 3115: 3109: 3098: 3093: 3089: 3084: 3078: 3074: 3067: 3062: 3059: 3050: 3044: 3037: 3028: 3022: 3016: 3005:colexicographic 2987:(in blue). The 2977: 2952: 2947: 2946: 2944: 2941: 2940: 2924: 2921: 2920: 2903: 2898: 2897: 2895: 2892: 2891: 2872: 2869: 2868: 2848: 2843: 2842: 2840: 2837: 2836: 2819: 2814: 2813: 2811: 2808: 2807: 2791: 2788: 2787: 2771: 2768: 2767: 2745: 2742: 2741: 2721: 2716: 2715: 2713: 2710: 2709: 2686: 2681: 2680: 2678: 2675: 2674: 2650: 2645: 2644: 2642: 2639: 2638: 2621: 2616: 2615: 2613: 2610: 2609: 2586: 2583: 2582: 2562: 2557: 2556: 2554: 2551: 2550: 2528: 2523: 2522: 2520: 2517: 2516: 2473: 2461: 2458: 2457: 2436: 2431: 2430: 2428: 2425: 2424: 2400: 2397: 2396: 2377: 2374: 2373: 2352: 2347: 2346: 2344: 2341: 2340: 2337: 2311: 2308: 2307: 2282: 2279: 2278: 2262: 2259: 2258: 2243:natural numbers 2232: 2227: 2166: 2163: 2162: 2128: 2125: 2124: 2101: 2098: 2097: 2078: 2075: 2074: 2073:of a given set 2060: 2023: 2020: 2019: 2014:, converted in 1974: 1971: 1970: 1959: 1938: 1935: 1934: 1918: 1915: 1914: 1898: 1895: 1894: 1849: 1846: 1845: 1829: 1826: 1825: 1806: 1803: 1802: 1786: 1783: 1782: 1763: 1760: 1759: 1758:of elements of 1743: 1740: 1739: 1723: 1720: 1719: 1700: 1697: 1696: 1690: 1681: 1680:either because 1669: 1644: 1641: 1640: 1636: 1620: 1617: 1616: 1599: 1595: 1581: 1578: 1577: 1543: 1540: 1539: 1529:natural numbers 1514:totally ordered 1497: 1494: 1493: 1477: 1474: 1473: 1446: 1442: 1433: and  1431: 1425: 1421: 1414: 1410: 1405: 1399: 1395: 1384: 1373: 1369: 1360: 1356: 1355: 1351: 1331: 1328: 1327: 1305: 1302: 1301: 1297: 1296: 1277: 1274: 1273: 1257: 1254: 1253: 1228: 1225: 1224: 1207: 1203: 1201: 1198: 1197: 1181: 1178: 1177: 1160: 1156: 1141: 1137: 1135: 1132: 1131: 1120: 1109: 1087: 1084: 1083: 1071: 1043: 1020: 1002: 986: 983: 982: 959: 956: 955: 936: 933: 932: 914: 911: 910: 891: 888: 887: 859: 846: 843: 842: 827: 816: 805: 793: 787: 781: 775: 769: 763: 755: 754:is a prefix of 749: 736: 730: 724: 718: 712: 706: 703:totally ordered 676: 673: 672: 667: 651: 648: 647: 637: 631: 625: 615: 605: 599: 589: 586:monoid of words 582: 580:Monoid of words 559:signed integers 525:natural numbers 506: 491: 481: 475: 448: 439: 436: 427: 419: 418:if and only if 409: 403: 400: 391: 385: 375: 372: 363: 357: 347: 327: 324: 323: 317: 311: 294: 284: 278: 272: 266: 263:totally ordered 252: 233:The words in a 231: 163:(also known as 149: 126: 115: 109: 106: 63: 61: 51: 39: 28: 23: 22: 15: 12: 11: 5: 4480: 4470: 4469: 4464: 4450: 4449: 4448:at Wikiversity 4435: 4434:External links 4432: 4429: 4428: 4391: 4378: 4363: 4326: 4319: 4298: 4291: 4269: 4268: 4266: 4263: 4262: 4261: 4256: 4254:Shortlex order 4251: 4245: 4240: 4235: 4230: 4225: 4220: 4215: 4209: 4203: 4198: 4191: 4188: 4169: 4166: 4163: 4160: 4157: 4154: 4151: 4148: 4145: 4142: 4139: 4136: 4133: 4130: 4127: 4124: 4121: 4118: 4115: 4112: 4109: 4106: 4103: 4100: 4097: 4094: 4091: 4088: 4085: 4082: 4079: 4076: 4073: 4070: 4067: 4064: 4061: 4058: 4055: 4052: 4049: 4046: 4043: 4040: 4037: 4034: 4031: 4028: 4006: 4003: 4000: 3997: 3994: 3991: 3988: 3985: 3982: 3979: 3976: 3973: 3970: 3967: 3964: 3961: 3958: 3955: 3952: 3949: 3946: 3943: 3940: 3937: 3934: 3931: 3928: 3925: 3922: 3919: 3916: 3913: 3910: 3907: 3904: 3901: 3898: 3895: 3892: 3889: 3886: 3883: 3880: 3877: 3874: 3871: 3868: 3845: 3840: 3836: 3832: 3827: 3823: 3814: 3804: 3800: 3796: 3791: 3787: 3774: 3770: 3766: 3763: 3760: 3755: 3751: 3747: 3742: 3738: 3734: 3731: 3728: 3723: 3719: 3698: 3693: 3689: 3685: 3682: 3679: 3674: 3670: 3666: 3661: 3657: 3653: 3650: 3647: 3642: 3638: 3617: 3612: 3608: 3604: 3601: 3598: 3593: 3589: 3585: 3582: 3579: 3574: 3570: 3566: 3563: 3560: 3555: 3551: 3547: 3537: 3523: 3506: 3501: 3496: 3469: 3464: 3440: 3435: 3405: 3400: 3396: 3390: 3386: 3380: 3375: 3371: 3365: 3361: 3328: 3325: 3322: 3319: 3316: 3313: 3305: 3302: 3299: 3276:monomial order 3250:Monomial order 3248:Main article: 3245: 3242: 3222: 3221: 3211: 3210: 3196: 3195: 3189: 3180: 3165: 3158: 3148: 3141: 3135: 3126: 3119: 3113: 3103: 3102: 3096: 3087: 3077:for the first 3072: 3065: 3055: 3048: 3042: 3033: 3026: 3020: 2976: 2973: 2972: 2971: 2960: 2955: 2950: 2928: 2906: 2901: 2888: 2876: 2851: 2846: 2822: 2817: 2795: 2775: 2755: 2752: 2749: 2729: 2724: 2719: 2694: 2689: 2684: 2658: 2653: 2648: 2624: 2619: 2590: 2570: 2565: 2560: 2536: 2531: 2526: 2502: 2499: 2496: 2493: 2490: 2487: 2484: 2481: 2471: 2468: 2465: 2439: 2434: 2404: 2384: 2381: 2355: 2350: 2336: 2333: 2321: 2318: 2315: 2295: 2292: 2289: 2286: 2266: 2248: 2239: 2238: 2237: 2236: 2212: 2209: 2206: 2203: 2200: 2197: 2194: 2191: 2188: 2185: 2182: 2179: 2176: 2173: 2170: 2156:shortlex order 2146: 2132: 2108: 2105: 2085: 2082: 2071:finite subsets 2048: 2045: 2042: 2039: 2036: 2033: 2030: 2027: 1999: 1996: 1993: 1990: 1987: 1984: 1981: 1978: 1958: 1957:Finite subsets 1955: 1942: 1922: 1902: 1880: 1877: 1874: 1871: 1868: 1865: 1862: 1859: 1856: 1853: 1833: 1813: 1810: 1790: 1770: 1767: 1747: 1727: 1704: 1689: 1686: 1657: 1654: 1651: 1648: 1624: 1602: 1598: 1594: 1591: 1588: 1585: 1562: 1559: 1556: 1553: 1550: 1547: 1501: 1481: 1459: 1455: 1449: 1445: 1441: 1438: 1428: 1424: 1420: 1417: 1413: 1407: or  1402: 1398: 1394: 1391: 1382: 1376: 1372: 1368: 1363: 1359: 1354: 1350: 1347: 1344: 1341: 1338: 1335: 1326:is defined as 1315: 1312: 1309: 1284: 1281: 1261: 1235: 1232: 1210: 1206: 1185: 1163: 1159: 1155: 1152: 1149: 1144: 1140: 1119: 1116: 1097: 1094: 1091: 1076:) < length( 1069: 1065: 990: 966: 963: 943: 940: 919: 895: 875: 872: 869: 866: 856: 853: 850: 839: 838: 837: 836: 825: 814: 800: 799: 760: 683: 680: 655: 587: 581: 578: 561:in computers. 505: 502: 466: 464:shortlex order 455: 454: 445: 432: 423: 396: 389: 383: 368: 361: 355: 331: 230: 227: 128: 127: 42: 40: 33: 26: 9: 6: 4: 3: 2: 4479: 4468: 4465: 4463: 4460: 4459: 4457: 4447: 4442: 4438: 4437: 4424: 4420: 4415: 4410: 4406: 4402: 4395: 4388: 4382: 4374: 4370: 4366: 4364:3-540-57456-5 4360: 4356: 4352: 4348: 4343: 4342: 4336: 4330: 4322: 4316: 4312: 4305: 4303: 4294: 4288: 4284: 4277: 4275: 4270: 4260: 4257: 4255: 4252: 4249: 4246: 4244: 4241: 4239: 4236: 4234: 4233:Leximin order 4231: 4229: 4226: 4224: 4221: 4219: 4216: 4213: 4210: 4207: 4204: 4202: 4199: 4197: 4194: 4193: 4187: 4185: 4180: 4167: 4161: 4158: 4155: 4152: 4149: 4143: 4137: 4134: 4131: 4128: 4125: 4119: 4113: 4110: 4107: 4104: 4101: 4095: 4089: 4086: 4083: 4080: 4077: 4071: 4065: 4062: 4059: 4056: 4053: 4047: 4041: 4038: 4035: 4032: 4029: 4017: 4001: 3998: 3995: 3992: 3989: 3983: 3977: 3974: 3971: 3968: 3965: 3959: 3953: 3950: 3947: 3944: 3941: 3935: 3929: 3926: 3923: 3920: 3917: 3911: 3905: 3902: 3899: 3896: 3893: 3887: 3881: 3878: 3875: 3872: 3869: 3856: 3843: 3838: 3834: 3830: 3825: 3821: 3812: 3802: 3798: 3794: 3789: 3785: 3772: 3768: 3764: 3761: 3758: 3753: 3749: 3745: 3740: 3736: 3732: 3729: 3726: 3721: 3717: 3696: 3691: 3687: 3683: 3680: 3677: 3672: 3668: 3664: 3659: 3655: 3651: 3648: 3645: 3640: 3636: 3610: 3606: 3602: 3599: 3596: 3591: 3587: 3580: 3572: 3568: 3564: 3561: 3558: 3553: 3549: 3535: 3532: 3530: 3529:total degrees 3525: 3521: 3518: 3504: 3499: 3485: 3467: 3438: 3422: 3403: 3398: 3394: 3388: 3384: 3378: 3373: 3369: 3363: 3359: 3349: 3347: 3326: 3323: 3320: 3317: 3314: 3311: 3303: 3300: 3297: 3289: 3285: 3281: 3277: 3273: 3272:Gröbner bases 3269: 3265: 3261: 3257: 3251: 3241: 3239: 3235: 3234:combinatorics 3231: 3227: 3216: 3215: 3214: 3205: 3204: 3203: 3200: 3192: 3183: 3174: 3170:for the last 3168: 3161: 3151: 3147: 3140: 3134: 3129: 3125: 3118: 3112: 3108: 3107: 3106: 3099: 3090: 3081: 3075: 3068: 3058: 3054: 3047: 3041: 3036: 3032: 3025: 3019: 3015: 3014: 3013: 3010: 3006: 2998: 2995:order are in 2994: 2990: 2986: 2981: 2958: 2953: 2926: 2904: 2889: 2887:is injective; 2874: 2867: 2866: 2865: 2849: 2820: 2793: 2773: 2753: 2750: 2747: 2727: 2722: 2706: 2692: 2687: 2672: 2656: 2651: 2622: 2607: 2603: 2588: 2568: 2563: 2547: 2534: 2529: 2513: 2500: 2497: 2494: 2491: 2488: 2485: 2482: 2479: 2469: 2466: 2463: 2455: 2437: 2422: 2418: 2402: 2382: 2379: 2371: 2353: 2332: 2319: 2316: 2313: 2293: 2290: 2287: 2284: 2264: 2256: 2252: 2246: 2244: 2231: 2230: 2226: 2225: 2224: 2207: 2204: 2201: 2198: 2195: 2192: 2189: 2186: 2183: 2180: 2177: 2171: 2168: 2159: 2157: 2153: 2148: 2144: 2130: 2122: 2106: 2103: 2083: 2080: 2072: 2068: 2067:combinatorics 2046: 2040: 2037: 2034: 2031: 2028: 2017: 2013: 1997: 1991: 1988: 1985: 1982: 1979: 1968: 1963: 1954: 1940: 1920: 1900: 1891: 1878: 1872: 1866: 1863: 1857: 1851: 1831: 1811: 1808: 1788: 1768: 1765: 1745: 1725: 1718: 1702: 1695: 1685: 1679: 1675: 1655: 1652: 1649: 1646: 1622: 1600: 1592: 1589: 1586: 1576: 1560: 1554: 1551: 1548: 1537: 1532: 1530: 1525: 1523: 1522:product order 1519: 1515: 1499: 1479: 1470: 1457: 1453: 1443: 1439: 1436: 1422: 1418: 1415: 1411: 1396: 1392: 1389: 1380: 1370: 1366: 1357: 1352: 1348: 1342: 1339: 1336: 1313: 1310: 1307: 1282: 1279: 1259: 1252: 1247: 1233: 1230: 1208: 1204: 1183: 1161: 1157: 1153: 1150: 1147: 1142: 1138: 1129: 1125: 1115: 1112: 1095: 1092: 1089: 1079: 1075: 1067: 1064: 1061: 1058: 1055: 1051: 1047: 1039: 1035: 1031: 1027: 1024: 1019: 1013: 1009: 1005: 988: 980: 964: 961: 941: 938: 917: 907: 893: 873: 870: 867: 864: 854: 851: 848: 834: 830: 826: 823: 819: 815: 812: 808: 804: 803: 802: 801: 796: 790: 784: 778: 772: 766: 761: 758: 752: 748: 747: 746: 743: 739: 733: 727: 721: 715: 709: 704: 700: 695: 681: 678: 670: 653: 644: 640: 634: 628: 623: 618: 613: 612:concatenation 608: 602: 597: 592: 585: 577: 575: 571: 567: 562: 560: 556: 552: 547: 545: 541: 536: 534: 530: 526: 522: 518: 514: 509: 501: 499: 494: 489: 484: 478: 472: 468: 465: 462: 460: 459:combinatorics 451: 446: 442: 435: 431: 426: 422: 416: 412: 406: 399: 395: 388: 382: 378: 371: 367: 360: 354: 350: 345: 344: 343: 329: 320: 314: 309: 304: 301: 297: 291: 287: 281: 275: 269: 264: 260: 255: 251: 246: 244: 243:encyclopedias 240: 236: 226: 224: 220: 216: 211: 209: 205: 201: 197: 196:combinatorics 192: 188: 186: 182: 178: 174: 170: 166: 165:lexical order 162: 158: 157:lexicographic 154: 147: 143: 139: 135: 124: 121: 113: 102: 99: 95: 92: 88: 85: 81: 78: 74: 71: â€“  70: 66: 65:Find sources: 59: 55: 49: 48: 43:This article 41: 37: 32: 31: 19: 4467:Lexicography 4462:Order theory 4404: 4400: 4394: 4386: 4381: 4340: 4329: 4310: 4283:Ordered Sets 4282: 4248:Star product 4181: 4018: 3857: 3533: 3526: 3519: 3420: 3350: 3346:tangent cone 3278:, that is a 3253: 3223: 3212: 3201: 3197: 3187: 3178: 3172: 3163: 3156: 3149: 3145: 3138: 3132: 3127: 3123: 3116: 3110: 3104: 3094: 3085: 3079: 3070: 3063: 3056: 3052: 3045: 3039: 3034: 3030: 3023: 3017: 3008: 3004: 3002: 2996: 2992: 2707: 2602:linear forms 2548: 2514: 2338: 2240: 2160: 2149: 2123:a subset of 2064: 1892: 1691: 1575:Cantor space 1533: 1526: 1471: 1248: 1123: 1121: 1110: 1077: 1073: 1059: 1053: 1049: 1045: 1037: 1033: 1029: 1025: 1022: 1011: 1007: 1003: 908: 840: 832: 828: 821: 817: 810: 806: 794: 788: 782: 776: 770: 764: 756: 750: 741: 737: 731: 725: 719: 713: 707: 696: 668: 642: 638: 632: 626: 616: 606: 600: 590: 583: 563: 548: 540:real numbers 537: 510: 507: 497: 492: 488:well-ordered 482: 476: 473: 469: 457:However, in 456: 449: 440: 433: 429: 424: 420: 414: 410: 404: 397: 393: 386: 380: 376: 369: 365: 358: 352: 348: 318: 312: 307: 305: 299: 295: 289: 285: 279: 273: 267: 253: 247: 239:dictionaries 232: 214: 212: 193: 189: 177:dictionaries 168: 164: 160: 156: 150: 116: 110:January 2022 107: 97: 90: 83: 76: 64: 52:Please help 47:verification 44: 4243:Lyndon word 3628:if either 3482:(see above 3280:total order 3256:polynomials 3009:colex order 2454:total order 2421:group order 2152:cardinality 596:free monoid 542:written in 261:, which is 202:of a given 153:mathematics 4456:Categories 4373:0922.68073 4353:. p.  4265:References 3262:, such as 3260:algorithms 2306:for every 1844:such that 1678:Noetherian 1635:(that is, 1223:for every 979:well-order 729:such that 636:such that 250:finite set 229:Definition 204:finite set 80:newspapers 4196:Collation 3831:≠ 3762:⋯ 3730:⋯ 3681:⋯ 3649:⋯ 3600:… 3562:… 3288:monomials 3244:Monomials 2927:φ 2875:φ 2794:φ 2751:≤ 2581:In fact, 2035:… 1986:… 1864:≠ 1601:ω 1520:of their 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