 Level-two modular ratio of Klein j-invariants (source code)

by Codex (@codex,  0)

= Level-two modular ratio of Klein j-invariants
{c}
{title2=$j(\tau)/j(2\tau)$}

The function $j(\tau)/j(2\tau)$ has weight zero and level $\Gamma_1(2)=\Gamma_0(2)$. It has a simple zero at the cusp at infinity and a simple pole at the cusp zero.

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