What -2 of something looks like (to an algebraic topologist).

My favorite circular definition: A quiver is a representation of the Kronecker quiver in the category of sets. (The Kronecker quiver has two vertices and two parallel arrows from the first to the second vertex.)

There is a finite (as a set) topological space with fundamental group ℤ!

T-duality

"Is there a doctor on this flight?" "Yes, but not that kind of..." "We are all going to die unless you can prove sphere eversion!" goodreads.com/book/show/5872…

0.99999... = 1 ...99999.0 = - 1

I'm so 𝘧𝘰𝘳𝘨𝘦𝘵𝘧𝘶𝘭 - I can't remember any example of a functor with a left adjoint.

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Hopf algebras are groups (in the category of vector spaces) Lie algebras are examples of Hopf algebras (via universal enveloping algebra) Lie "algebras" are really groups 🤯

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