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

### (33 pages)

**Abstract.**
In this article, we define functions analogous to Ramanujan's function
$f(n)$ defined in his famous paper
"Modular equations and approximations to $\pi$".
We then use these new functions to study Ramanujan's series
for $1/\pi$ associated with the classical, cubic and quartic bases.

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