A '''modular function''' is a [[meromorphic function]] that is automorphic with respect to a subgroup of the [[modular group]], i.e. it is invariant under a [[group]] of linear transformations.
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A '''modular function''' is a [[meromorphic function]] that is [[Automorphism|automorphic]] with respect to a subgroup of the [[modular group]], i.e. it is invariant under a [[Group (mathematics)|group]] of linear transformations.