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Topological strings: Why is the complex structure for $T^2$ denoted as $\tau$ in string theory?

To a topologist, the moduli space of tori is 0-dimensional, since there is only one 2d topological surface with genus 1). … So the moduli space is parametrized by either the pair $(R_1,R_2)$ or $(A,\tau)$. …
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