For a commutative ring $R$ and an $R$-module $M$ equipped with an action of Hecke operators, such as spaces of modular forms or modular symbols, the associated $R$-Hecke algebra is the $R$-subalgebra of the $R$-endomorphism ring of $M$ generated by the Hecke operators.
We usually include all Hecke operators, i.e. also those the index of which divides the level or is a multiple of the characteristic (if applicable).
If the ring $R$ is not mentioned, then it is either $\Q$ or $\C$, depending on the context.
- Review status: beta
- Last edited by Samuele Anni on 2018-02-16 11:28:59