Representability ofGL E
Copyright policy )Representability ofGL E
Let $S$ be a noetherian scheme, and let $E$ be a coherent sheaf on it. We define a group-valued contravariant functor $GL_E$ on $S$-schemes by associating to any $S$-scheme $T$ the group $GL_E(T)$ of all linear automorphisms of the pullback of $E$ to $T$. This functor is clearly a sheaf in the fpqc topology. We prove that $GL_E$ is representable by a group-scheme over $S$ if and only if the sheaf $E$ is locally free.
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Mathematics - Algebraic Geometry, Group schemes, automorphism of a coherent sheaf, FOS: Mathematics, representability by a group scheme, Sheaves, derived categories of sheaves, etc., Algebraic Geometry (math.AG), 14L15, Birational automorphisms, Cremona group and generalizations
Mathematics - Algebraic Geometry, Group schemes, automorphism of a coherent sheaf, FOS: Mathematics, representability by a group scheme, Sheaves, derived categories of sheaves, etc., Algebraic Geometry (math.AG), 14L15, Birational automorphisms, Cremona group and generalizations
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