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Appell–Humbert theorem : ウィキペディア英語版
Appell–Humbert theorem
In mathematics, the Appell–Humbert theorem describes the line bundles on a complex torus or complex abelian variety.
It was proved for 2-dimensional tori by and , and in general by
==Statement==
Suppose that ''T'' is a complex torus given by ''V''/''U'' where ''U'' is a lattice in a complex vector space ''V''. If ''H'' is a Hermitian form on ''V'' whose imaginary part ''E'' is integral on ''U''×''U'', and α is a map from ''U'' to the unit circle such that
:\alpha(u+v) = e^\alpha(u)\alpha(v)\
then
: \alpha(u)e^\
is a 1-cocycle on ''U'' defining a line bundle on ''T''.
The Appell–Humbert theorem says that every line bundle on ''T'' can be constructed like this for a unique choice of ''H'' and α satisfying the conditions above.

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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