Abstract
So that we may define Ramanujan’sclass invariants, set
$$
(a;q)_\infty = \prod\limits_{n = 0}^\infty {(1 - aq^n )} ,\left| q \right| < 1,
$$
and
$$
\chi (q) = ( - q;q^2 )_\infty
$$
((1.1))
.
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© 1998 Springer Science+Business Media New York
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Berndt, B.C. (1998). Class Invariants and Singular Moduli. In: Ramanujan’s Notebooks. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-1624-7_4
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DOI: https://doi.org/10.1007/978-1-4612-1624-7_4
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