# Wronskians of theta functions and series for $1/\pi$

### (35 pages)

Abstract. In this article, we define functions analogous to Ramanujan's function $f(m)$ defined in his famous paper "Modular equations and approximations to $1/\pi$". We then show how these new functions lead to simpler formulas for series for $1/\pi$ associated with the classical, cubic and quartic base.

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