Klein invariant J
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Revision as of 13:20, 19 January 2015 by Tom (talk | contribs) (Tom moved page Klein's j-invariant to Klein's invariant J)
The Klein j-invariant $j(\tau)$ is the modular function which encodes arithmetic information about the singular moduli of imaginary quadratic fields.
It is invariant under the full modular group $\mathbf{SL}(2,\mathbb{Z})$.
