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# Questions

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### Periodic matrices

aug 20 11 at 8:26 Mark Sapir 27.6k257118

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### Strange real functions

dec 11 10 at 20:54 Joel David Hamkins 75k7187343

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### Cyclic Sylow $p$-subgroup in finite simple groups

oct 14 at 13:40 Portland 1,904316

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### Morphisms $\mathrm{SL}_n(\mathbb Z) \to \mathrm{SL}_m(\mathbb Z)$

apr 10 at 0:22 Tom Goodwillie 26.7k258110

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### Product of sine

feb 2 12 at 16:27 spanferkel 88329

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### Unpublished work of Wielandt

apr 14 12 at 3:22 cimo 111

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### Hopfian and Co-Hopfian groups (examples)

mar 28 11 at 10:03 Yiftach Barnea 2,31011018

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### Infinitely many prime numbers of the form $n^{2^k}+1$?

feb 25 12 at 6:22 Germán 1

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### Prime numbers that lead to relatively prime

mar 26 10 at 3:33 Qiaochu Yuan 38.4k5116301

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