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S-equivalence : ウィキペディア英語版
S-equivalence

S-equivalence is an equivalence relation on the families of semistable vector bundles on an algebraic curve.
== Definition ==
Let ''X'' be a projective curve over an algebraically closed field ''k''. A vector bundle on ''X'' can be considered as a locally free sheaf. Every semistable locally free ''E'' on ''X'' admits a Jordan-Hölder filtration with stable subquotients, i.e.
: 0 = E_0 \subseteq E_1 \subseteq \ldots \subseteq E_n = E
where E_i are locally free sheaves on ''X'' and E_i/E_ are stable. Although the JH-Filtration is not unique, the subquotients are, which means that gr E = \bigoplus_i E_i/E_ is unique up to isomorphism.
Two semistable locally free sheaves ''E'' and ''F'' on ''X'' are ''S''-equivalent if ''gr E'' ≅ ''gr F''.


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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