Some eta-function identities deducible from Ramanujan's \(_ 1\Psi_ 1\) summation
The authors present identities for twelve products of Dedekind's eta function. The identities are simply deduced from a formula of \textit{S. Ramanujan} [p. 196, entry 17 in the ``Notebooks'', Vol. II (Bombay, 1957; Zbl 0138.242)]. Each of these eta products is an entire modular form, but not a cusp form, of weight 2 on some congruence group of level 24. The identities might be rewritten as Eisenstein series expansion.
scientific article; zbMATH DE number 399084