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Concept
Riemann form
Summary
In mathematics, a Riemann form in the theory of abelian varieties and modular forms, is the following data:
A lattice Λ in a complex vector space Cg.
An alternating bilinear form α from Λ to the integers satisfying the following Riemann bilinear relations:
the real linear extension αR:Cg × Cg→R of α satisfies αR(iv, iw)=αR(v, w) for all (v, w) in Cg × Cg;
the associated hermitian form H(v, w)=αR(iv, w) + iαR(v, w) is positive-definite.
(The hermitian form written here is linear in the first variable.)
Riemann forms are important because of the following:
The alternatization of the Chern class of any factor of automorphy is a Riemann form.
Conversely, given any Riemann form, we can construct a factor of automorphy such that the alternatization of its Chern class is the given Riemann form.
Official source
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