In number theory, the diamond operators 〈d〉 are operators acting on the space of modular forms for the group Γ1(N), given by the action of a matrix (a b
c d) in Γ0(N). The diamond operators form an abelian group and commute with the Hecke operators.
- "Mathematical Operators – Unicode" (PDF). Retrieved 2013-04-22.
- Diamond, Fred; Shurman, Jerry (2005), A first course in modular forms, Graduate Texts in Mathematics, 228, Berlin, New York: Springer-Verlag, ISBN 978-0-387-23229-4, MR 2112196
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