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In this note we apply a theorem of Sturm [S]
to prove a bound on the number of Hecke operators
needed to generate the Hecke algebra as a
-module.
This bound was observed by to Ken Ribet, but has not
been written down.
In section 2 we record our notation and some standard theorems.
In section 3 we state Sturm's theorem and use it to deduce
a bound on the number of generators of the Hecke algebra.
William A Stein
2002-02-01