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S. Carnahan's user avatar
S. Carnahan's user avatar
S. Carnahan
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awarded
 Nice Answer
comment
How to make commutative algebraic groups strongly dualizable?
There is a (stable infinity) category of complexes of abelian sheaves on a base, but not all objects are strongly dualizable. You need some kind of finiteness to get good duality.
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How to make commutative algebraic groups strongly dualizable?
This is better.
revised
How to make commutative algebraic groups strongly dualizable?
response to edited question
revised
Constructing a degeneration (as a group scheme) of G_m to G_a
explanation
answered
Constructing a degeneration (as a group scheme) of G_m to G_a
answered
How to make commutative algebraic groups strongly dualizable?
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What is the geometric significance of Cartan's structure equations?
Have you thought about asking the administrators to merge your many accounts with the same name?
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How to make commutative algebraic groups strongly dualizable?
-1. Please make your questions more specific. In particular, you haven't mentioned a category in which B lives.
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Cogroup objects
\vee describes the wedge operation, while \wedge describes smash product.
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Hopf algebra structure on the universal enveloping algebra of a Leibniz algebra?
I'm curious: where do Leibniz algebras show up in mathematics?
answered
"Misbehaved" differential equations
comment
Are there two groups which are categorically Morita equivalent but only one of which is simple
Don't the actions of A and B have to commute?
answered
Does any method of summing divergent series work on the harmonic series?
awarded
 Civic Duty
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Is the fixed locus of a group action always a scheme?
I think the problem is that Fix isn't even a functor. It doesn't seem to respect morphisms.
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Division Algebras as Algebraic Groups
@Joel: After base change to a matrix ring, the norm becomes the determinant.
answered
Is the fixed locus of a group action always a scheme?
revised
Do orbits and stable loci of group actions have natural scheme structures?
removed solution 2
answered
Do orbits and stable loci of group actions have natural scheme structures?
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