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# Questions

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### Is {Ø,{Ø},{Ø,{Ø}}, … } the only known universe?

jul 31 10 at 17:09 Andreas Blass 33k454109

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### 2-TQFT are to Frobenius Algebras as ??? are to Hopf Algebras

jun 22 at 1:49 Carlos Segovia 1

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### Fundamental group of R^2 minus the (ir)rationals

nov 20 10 at 22:44 Jeremy Brazas 1,5161512

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### Flux through a Mobius strip

jan 9 11 at 3:04 KConrad 17k361117

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### Does $\pi_1$ have a right adjoint?

nov 8 10 at 22:30 Jeremy Brazas 1,5161512

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### The open problem of nth quantization

jan 13 12 at 0:55 tetrapharmakon 899211

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### Is the subobject functor really a presheaf?

sep 3 10 at 10:24 Peter Arndt 6,8881842

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### Understanding Penrose diagrammatical notation

apr 16 at 21:01 Aleks Kissinger 951311

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### “orthogonal” and “parallel” morphisms?

mar 17 11 at 17:05 tetrapharmakon 899211

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