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# Cusp Forms Like $\Delta$

Published:2009-03-01
Printed: Mar 2009
• C. J. Cummins
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## Abstract

Let $f$ be a square-free integer and denote by $\Gamma_0(f)^+$ the normalizer of $\Gamma_0(f)$ in $\SL(2,\R)$. We find the analogues of the cusp form $\Delta$ for the groups $\Gamma_0(f)^+$.
 MSC Classifications: 11F03 - Modular and automorphic functions 11F22 - Relationship to Lie algebras and finite simple groups 30F35 - Fuchsian groups and automorphic functions [See also 11Fxx, 20H10, 22E40, 32Gxx, 32Nxx]