Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
MathOverflow is a question and answer site for professional mathematicians. It only takes a minute to sign up.
What is the original paper in which Erich Hecke had first introduced the Hecke operators?
Über Modulfunktionen und die Dirichletschen Reihen mit Eulerscher Produktentwicklung. I, Math. Ann. 114 (1937), 1-28; II, ibid., 316-351. These two papers are available here and here.
Required, but never shown