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Jan
12
answered Are units in rigid (autonomous) categories some sort of natural transformation?
Jan
12
answered Frobenius map in scheme theory
Jan
12
answered Show that function $f: A \to B$ is surjective when there is an implication: $g \circ f = h\circ f \to g=h$
Jan
5
answered Rel is a concrete category over Sets, but how to concretize that?
Jan
5
answered Precomposing a rational function $f$ with a birational isomorphism $g$ to make $f\circ g$ regular?
Jan
4
asked What is the algebraic tangent cone really?
Jan
3
answered A question on Mumford's drawing of $\text{Spec}\,\mathbb{Z}[x]$
Jan
2
answered Sheafication of a presheaf
Jan
1
answered Explicitly describe colimits in $\mathsf{Set}$
Dec
31
answered “Twist” of $\mathbb P^n_K$ through a field automorphism.
Dec
29
answered Discrete simplicial spaces are fibrant
Dec
27
answered Categorical Pasting Lemma
Dec
19
answered Group objects in the category of rings
Dec
16
answered Colimit in the category of (all) simply transitive group actions
Dec
15
answered Reference for $(\infty,1)$-Categories
Dec
12
answered About certain regular epimorphisms in a Grothendieck Topos
Dec
12
answered Module of differentials in the functorial approach to schemes and quasi-coherent modules
Dec
10
answered Geometric Homotopy as Chain Homotopy
Dec
4
answered Model structure on sSet
Dec
3
answered A category with arbitrary products, but not all limits, or finite limits not commuting with filtered colimits?