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# Questions

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### What’s tropical about tropical algebra?

sep 23 11 at 11:54 Gjergji Zaimi 37.5k272149

10
3
472
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### When is a matrix power nonnegative

oct 18 11 at 17:44 Robert Israel 10.8k822

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### History of the triangle inequality

aug 9 11 at 12:31 Gerald Edgar 15.2k12867

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### Matrix inversion lemma with pseudoinverses

aug 5 11 at 1:03 Michael Hardy 4,43912248

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656
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### Divisibility of a binomial coefficient by $p^2$ — current status

jul 28 at 8:37 Mark Grant 9,06111333

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### Generalization of the positive semidefinite Grothendieck inequality

jan 25 11 at 3:46 Steven Heilman 1014

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400
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### Expected norm of sum of random orthogonal matrices

nov 5 11 at 21:09 S. Sra 10k11644

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### What would be some major consequences of the inconsistency of ZFC?

dec 8 at 19:46 Jaykov Foukzon 1035

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### Alternating sums of GCDs

jan 7 12 at 20:45 Alan Haynes 1,149111

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