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Weber modular function : ウィキペディア英語版
Weber modular function
In mathematics, the Weber modular functions are a family of three modular functions ''f'', ''f''1, and ''f''2, studied by Heinrich Martin Weber.
==Definition==

Let q = e^ where ''τ'' is an element of the upper half-plane.
:\begin
\mathfrak(\tau) &= q^}\prod_(1+q^}) = e^}\frac\big)}=\frac\big)\eta(2\tau)}\\
\mathfrak_1(\tau) &= q^}\prod_(1-q^}) = \frac\big)}\\
\mathfrak_2(\tau) &= \sqrt2\, q^}\prod_(1+q^)= \frac
\end
where\eta(\tau) is the Dedekind eta function. Note the eta quotients immediately imply that,
:\mathfrak(\tau)\mathfrak_1(\tau)\mathfrak_2(\tau) =\sqrt
The transformation ''τ'' → –1/''τ'' fixes ''f'' and exchanges ''f''1 and ''f''2. So the 3-dimensional complex vector space with basis ''f'', ''f''1 and ''f''2 is acted on by the group SL2(Z).

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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