On the spectral gap for infinite index ``congruence subgroups of SL\(_2(\mathbb{Z})\)

DOI10.1007/BF02784530zbMath1028.11031OpenAlexW1978425701MaRDI QIDQ1611539

Alexander Gamburd

Publication date: 2 March 2003

Published in: Israel Journal of Mathematics (Search for Journal in Brave)

Full work available at URL: https://doi.org/10.1007/bf02784530

zbMATH Keywords

eigenvaluespectrummodular groupFuchsian groupcongruence subgroupsexpander graphsexpander graphSelberg's theorem

Mathematics Subject Classification ID

Extremal problems in graph theory (05C35) Graphs and abstract algebra (groups, rings, fields, etc.) (05C25) Spectral theory; trace formulas (e.g., that of Selberg) (11F72)

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