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Do the Baumslag-Solitar groups occur in nature?

aug 31 11 at 8:01 Andreas Thom 13.1k●1●23●65

 
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Is a non-abelian free group fully residually a finite non-abelian simple group?

may 8 10 at 8:39 Yiftach Barnea 2,310●1●10●18

 
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Formally undecidable problems on finitely presented quandles

aug 31 11 at 14:39 James 794●12●18

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Is there a residually nilpotent one-relator group that is not residually a finite p-group for any prime p?

oct 11 11 at 20:52 Mark Sapir 27.9k●2●57●120