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On eigenvalues of the Laplacian for Hecke triangle groups. (English) Zbl 0798.11017

Kurokawa, N. (ed.) et al., Zeta functions in geometry. Tokyo: Kinokuniya Company Ltd.. Adv. Stud. Pure Math. 21, 359-408 (1992).
This paper is a condensed version of chapter 1 of D. A. Hejhal [Eigenvalues of the Laplacian for Hecke triangle groups, Mem. Am. Math. Soc. 469 (1992; Zbl 0746.11025)].
At the end of §6 I found a discussion that is not in the book. There the author compares his computational results with those of A. M. Winkler [Cusp forms and Hecke groups; J. Reine Angew. Math. 386, 187-204 (1988; Zbl 0647.10019)].
For the entire collection see [Zbl 0771.00036].

MSC:

11F72 Spectral theory; trace formulas (e.g., that of Selberg)
11F37 Forms of half-integer weight; nonholomorphic modular forms
35P05 General topics in linear spectral theory for PDEs
11F30 Fourier coefficients of automorphic forms
30F35 Fuchsian groups and automorphic functions (aspects of compact Riemann surfaces and uniformization)
65N35 Spectral, collocation and related methods for boundary value problems involving PDEs