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4
votes
Accepted
Computing a cone in a $\otimes$-triangulated category
In what follows I am going to assume $\mathcal{T}$ is the homotopy category of a stably symmetric monoidal ∞-category. The argument I am going to give can probably be generalized to any case of intere …
20
votes
Accepted
Tensor product of fields over integers
I already wrote this in the comments but I think this might be worth of an answer. I think we can classify all fields $K$ such that $K\otimes K$ is a field.
Claim If $K$ is a field such that $K\otime …