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KleinInvariantJ
KleinInvariantJ[ ] gives the Klein invariant modular elliptic function .
Mathematical function (see Section A.3.10).
The argument is the ratio of Weierstrass half-periods .
KleinInvariantJ is given in terms of Weierstrass invariants by .
 is invariant under any combination of the modular transformations and .
See Section 3.2.11 for a discussion of argument conventions for elliptic functions.
See The Mathematica Book: Section 3.2.11.
See also: ModularLambda, DedekindEta, WeierstrassInvariants, EllipticTheta.
Further Examples
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