Heer

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Name	Heer
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the birth of the world is equivalent to Zorn's lemma

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Representability of sheaf of Ext^1 of a Néron model by $\mathbb{G}_m$

nov 25 at 16:58 quid 13.3k●31●51

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group of Yoneda extensions and the EXT groups defined via derived category

derived-category homological-algebra

may 17 11 at 15:27 Lux 56●1

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266

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What is the projective dimension of the ring $\mathbb{Z}_l[T,T^{-1}]$ ? l is a prime number

homological-algebra

may 1 11 at 14:58 Heer 221●7

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312

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what is the first Galois cohomology group of the Galois module End(T_l(A)) for some abelian variety A over a finite field k and l some prime number different from the characteristic of the base field?

arithmetic-geometry galois-theory

may 17 10 at 13:47 Xandi Tuni 2,730●5●18

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234

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about the local ring of $\mathbb{Z}_p[T]/(pT^2+T+1)$ at the prime p

ac.commutative-algebra

jun 16 at 12:20 Karl Schwede 11.5k●1●14●35

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191

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How to compute the first derived direct image along an open immersion, for the fppf sheaf represented by a multiplicative group?

ag.algebraic-geometry derived-functors

jul 26 at 17:49 Ray Hoobler 221●1●4

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507

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what is the tensor product of two anti-commutative DG-algebras?

dg-algebras

aug 31 10 at 4:05 Theo Johnson-Freyd 22.3k●2●27●110

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173

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about the fppf-hom sheaf $\mathscr{H}om(X,\mathbb{G}_a)$

ag.algebraic-geometry

sep 16 11 at 13:37 Heer 221●7

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106

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About Alexeev and Nakamura’s paper “on Mumford’s construction of degenerating abelian varieites”

ag.algebraic-geometry abelian-varieties toric-varieties

apr 11 at 15:46 Heer 221●7

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restriction and pullback of representable etale sheaf along closed immersion

ag.algebraic-geometry representable-functors sheaf-theory

dec 5 at 10:40 Heer 221●7

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Questions

Representability of sheaf of Ext^1 of a Néron model by $\mathbb{G}_m$

group of Yoneda extensions and the EXT groups defined via derived category

What is the projective dimension of the ring $\mathbb{Z}_l[T,T^{-1}]$ ? l is a prime number

what is the first Galois cohomology group of the Galois module End(T_l(A)) for some abelian variety A over a finite field k and l some prime number different from the characteristic of the base field?

about the local ring of $\mathbb{Z}_p[T]/(pT^2+T+1)$ at the prime p

How to compute the first derived direct image along an open immersion, for the fppf sheaf represented by a multiplicative group?

what is the tensor product of two anti-commutative DG-algebras?

about the fppf-hom sheaf $\mathscr{H}om(X,\mathbb{G}_a)$

About Alexeev and Nakamura’s paper “on Mumford’s construction of degenerating abelian varieites”

restriction and pullback of representable etale sheaf along closed immersion

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