Ben Blum-Smith

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84 Posts

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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
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