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Petersson inner product : ウィキペディア英語版
Petersson inner product
In mathematics the Petersson inner product is an inner product defined on the space
of entire modular forms. It was introduced by the German mathematician Hans Petersson.
==Definition==

Let \mathbb_k be the space of entire modular forms of weight k and
\mathbb_k the space of cusp forms.
The mapping \langle \cdot , \cdot \rangle : \mathbb_k \times \mathbb_k \rightarrow
\mathbb,
:\langle f , g \rangle := \int_\mathrm f(\tau) \overline
(\operatorname\tau)^k d\nu (\tau)
is called Petersson inner product, where
:\mathrm = \left\\tau \right| \leq \frac,
\left| \tau \right| \geq 1 \right\}
is a fundamental region of the modular group \Gamma and for \tau = x + iy
:d\nu(\tau) = y^dxdy
is the hyperbolic volume form.

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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