In mathematics, a Hilbert modular form is a generalization of modular forms to functions of two or more variables.
It is a (complex) analytic function on the m-fold product of upper half-planes satisfying a certain kind of functional equation.
Let F be a totally real number field of degree m over rational field. Let
be the real embeddings of F. Through them we have a map
- →
Let be the ring of integers of F. The group is called the full Hilbert modular group. For every element, there is a group action of defined by
For, define
A Hilbert modular form of weight is an analytic function on such that for every
Unlike the modular form case, no extra condition is needed for the cusps because of Koecher's principle.
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