25

Questions
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Is there a chess position equivalent to the Collatz conjecture?

may 17 11 at 8:55 the cane toad 1

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Do Shift-chain have Property B?

nov 25 10 at 14:53 domotorp 4,068●7●25

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Can select many disjoint pairs with prescribed differences from Z_n?

jun 15 10 at 14:10 Daniel Kohen 171●1●1●7

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Two [n] to [n] function families

feb 28 10 at 7:47 domotorp 4,068●7●25

 
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How hard is it to solve SAT if the promise is that it has an odd number of solutions?

aug 30 at 8:39 Vladimír Čunát 1

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What are conjectures that are true for primes but then turned out to be false for some composite number?

jan 4 at 17:20 pollington 11●1

 
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If every point is contained in at most 3 sets and all sets are big, then is the discrepancy zero?

jun 23 10 at 23:37 Gerry Myerson 15.7k●1●47●87

 
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Can you prove that hypergraphs with n-1 edges are partially 2 colorable?

mar 12 12 at 1:34 Oliver Kullmann 173●4

 
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What properties does generalized Delaunay triangulation have?

feb 21 at 16:25 Joseph O'Rourke 43.2k●1●49●214

 
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Can a simple curve intersect every subspace of dim 2 and avoid the origin?

aug 25 at 13:17 Anton Petrunin 16.5k●41●110

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