5
votes
Accepted
When is a (co)edge trivial in graph cohomology?
Sam Hopkins's suggestion is right, $e^{\vee}$ is trivial if and only if $e$ is a bridge. (I'm assuming that you are taking $e^{\vee}$ to be an element in the simplicial cochain complex, so ...
- 3,553
1
vote
Original reference of six functor formalism?
There doesn't exist a mathematical publication by Grothendieck explicitly presenting that formalism. It was going to be addressed in "Exposé 0" of SGA 5, but the editors excluded it from the ...
- 371
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