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Proceedings of the American Mathematical Society

ISSN 1088-6826(online) ISSN 0002-9939(print)



Decomposing algebraic vector bundles on the projective line

Author: Charles C. Hanna
Journal: Proc. Amer. Math. Soc. 61 (1976), 196-200
MSC: Primary 14F05
MathSciNet review: 0429898
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Abstract: $ \mathcal{V}(R)$ denotes the category of algebraic vector bundles on $ {\mathbf{P}}_R^1,\;R$ a commutative, noetherian ring. If $ K$ is a field, it is known that any $ \mathcal{F} \in \mathcal{V}(K)$ is isomorphic to a (unique) direct sum of line bundles. If $ \mathfrak{p} \in \operatorname{Spec} R$ and $ K(\mathfrak{p})$ is the quotient field of $ R/\mathfrak{p}$, any $ \mathcal{F} \in \mathcal{V}(R)$ induces a bundle in $ \mathcal{V}(K(\mathfrak{p}))$, and so a decomposition into line bundles. If the decomposition is the same for each $ \mathfrak{p},\;\mathcal{F}$ is said to be uniform. It is shown that if $ R$ is reduced, uniform vector bundles on $ {\mathbf{P}}_R^1$ are sums of tensor products of (pullbacks of) bundles on $ \operatorname{Spec} R$ with line bundles on $ {\mathbf{P}}_R^1$.

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Keywords: Algebraic vector bundle, projective line, commutative noetherian ring, projective module, uniform vector bundle, decomposition of vector bundles
Article copyright: © Copyright 1976 American Mathematical Society