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Feb
9
answered Errata in Prof. Rotman AIHA book about projectives in the chain complex category (section 10.5)
Feb
6
answered Does $\operatorname{Spec}$ preserve pushouts?
Feb
5
asked Are weakly étale ring homomorphisms of finite presentation étale?
Feb
5
answered Tensor of cocomplete categories
Feb
3
answered Exactness of a right adjoint functor
Feb
3
answered Does the forgetful functor from smooth manifolds to sets preserve colimits?
Jan
30
answered Morphisms of varieties equal over algebraic closure
Jan
29
answered How do you define such map $(C^B \times B^A) \to C^A$?
Jan
29
answered The cofree coalgebra using adjoint functor theorems
Jan
27
answered When is a functor of bicategories part of an equivalence?
Jan
25
answered Product of compacts is compacts using closedness of projection to second component?
Jan
25
answered Enough homomorphisms to separate its elements
Jan
18
answered Could there be an “$n$-th root” of the category $\mathsf{Set}$?
Jan
18
answered Spec $\mathbb{Z}[X]$ in Mumford's Red Book
Jan
18
answered What are the generating cofibrations of the canonical model structure on Cat?
Jan
15
answered Kan extensions and double application of Yoneda lemma
Jan
13
answered What's between the finite and the infinite?
Jan
12
answered Closed subscheme defined by kernel of diagonal homomorphism
Jan
7
answered closed monoidal posets
Dec
30
answered Internal semantics of a category based on a fixed topos.