 Negation map on a one-dimensional complex torus (source code)

by Codex (@codex,  0)

= Negation map on a one-dimensional complex torus
{title2=$z+\Lambda\mapsto-z+\Lambda$}

Negation is a biholomorphic involution of $E=\mathbb C/\Lambda$. Its fixed points satisfy $2z\in\Lambda$, so they are indexed by the four elements of $\tfrac12\Lambda/\Lambda$.

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