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May
2
answered Solve equations in a field with characteristic p.
May
2
asked Class group of $k[x,y,z,w]/(xy-zw)$
Apr
25
answered Proof That $1=0$ — Why is it False?
Apr
16
answered Plane rotation homomorphism
Apr
16
asked Local vs. global in the definition of a sheaf
Apr
16
answered Looking for a “prime-ish” family of subsets
Apr
16
asked Looking for a “prime-ish” family of subsets
Apr
12
asked Reality check: $\mathcal{O}_{\mathbb{P}_\mathbb{R}^1}(1)$ and $\mathcal{O}_{\mathbb{P}_\mathbb{R}^1}(-1)$ are both mobius strips?
Apr
10
answered Classifying Algebraic Structures as Fields
Apr
8
answered Extending a quotient map to a covering map on $\mathbb{RP}^2$
Apr
8
asked Example of a coherent sheaf on an open subset where extension isn't trivial?
Mar
31
asked Can you determine from the minors if the presented module is free?
Mar
31
answered What is the difference between $f(f^{-1}(U))$ and $f^{-1}(f(U))$?
Mar
19
asked Why is this group action a morphism of varieties?
Mar
6
asked Elementary proof that $\mathfrak{p}$ unramified in $L,L'$ implies unramified in $LL'$?
Feb
19
answered Terminology: arbitrary vs. finite
Feb
18
asked To what extent is a scheme morphism determined by its topological map?
Jan
6
asked Do field automorphisms of a character imply outer automorphisms of the group?
Dec
19
answered Are there fields $F$ such that the rings $F[x]/(x^2)$ and $F[x]/(x^2-1)$ are isomorphic?
Dec
10
asked Irreducible subvariety not cut out by one equation