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Feb
6
answered Natural Numbers Object and the Axiom of Infinity
Feb
5
answered Abstract homotopy invariance of homology
Feb
1
answered Homotopy category of chain complexes as a localization
Jan
31
answered Which maps on the zeroth homology do actually come from continuous maps?
Jan
31
answered Does the category of $k$-algebras have terminal objects?
Jan
23
answered $\mathfrak{Top}$ and injective objects
Jan
16
answered Extending a Homotopy from $X \times [0,1]$ to $X \times \mathbb{R}$
Jan
13
answered Is the existence of finite biproducts a strengthening of commutativity?
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