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    Theta Subgroup

    Alternate names
    Definition

    The set λ of linear Möbius transformations w which satisfy w(t) = (a t + b)/(c t + d), where a and d are odd and b and c are even. λ is a subgroup of the modular group Γ, and is also called the theta subgroup. The fundamental region of the modular lambda group is illustrated above.

    Related term

    modular group Γ

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