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Is there a point in the plane at a rational distance from all four corners of a unit square?
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The unit square can also be thought of as a subset of the
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249:"IFSs and the Interactive Design of Tiling Structures"
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unit square refers specifically to the square in the
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distance from all four vertices of the unit square.
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It is not known whether any point in the plane is a
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286:(1991),
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