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Mar
9
answered Is there a particularly simple example of geometric descent?
Mar
3
answered The intersection of affine subscheme and preimage of affine on separated scheme is affine
Mar
1
answered ``Minimal generating ring" for a field of fractions
Feb
28
answered is the property of representability of a sheaf on the big etale site checkable on the small site?
Feb
25
answered How can i show that the the category of pointed sets and the category of sets and partial functions are not isomorphic?
Feb
23
answered The terminal object comes for free in the definition of a subobject classifier
Feb
22
answered Is the group cohomology for a profinite group always torsion?
Feb
20
answered How to intrinsically think about simplicial objects.
Feb
19
answered example of a scheme where connected components aren't open
Feb
19
answered Can one drop the retracts in the definition of anodyne extensions?
Feb
16
answered Motivation behind the definition of monomorphism and epimorphism in category theory
Feb
15
asked The smooth Nullstellensatz
Feb
15
answered $\hom (M, \coprod_i N_i) \cong \bigoplus_i \hom (M, N_i)$ in abelian categories when $M$ is simple?
Feb
15
answered Show that there are non-well-founded models of Zermelo Fraenkel set theory
Feb
11
answered Understanding Hartshorne's proof that every projective morphism is proper.
Feb
10
answered Does this definition of the “roots” of an element of an arbitary $R$-algebra make sense? If so, where can I learn more?
Feb
8
answered CoKleisli category of the induced comonad of a monad
Feb
6
answered A variant of projective objects?
Feb
6
answered Natural Numbers Object and the Axiom of Infinity
Feb
5
answered Abstract homotopy invariance of homology