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Questions
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Numerical coincidence involving the number 1663

nov 19 11 at 23:43 David Eppstein 9,233●1●21●41

 
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Reference for sparseness of incomparability graphs implying sparseness of covering graphs

oct 25 11 at 23:29 David Eppstein 9,233●1●21●41

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Ax–Grothendieck and the Garden of Eden

mar 18 11 at 23:07 André Henriques 14.9k●2●30●83

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Is the 4x5 chessboard complex a link complement?

feb 10 12 at 2:52 jc 3,915●9●23

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Möbius-invariant triangle center?

may 27 10 at 1:00 Gjergji Zaimi 37.4k●2●72●149

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Order types of positive reals

may 18 10 at 10:45 Joel David Hamkins 74.9k●7●187●343