. . . "modular discriminant" . "-invariants" . "j-invariants" . "j-invariant function" . "J-invariant" . "j-invariant" . "''j'' function" . . . "j-function inverse" . "modular invariants" . "''j''" . "elliptic ''j''-function" . "space of planar lattices" . "-invariant" . "Klein's j-invariant" . . . "J-invariant" . . . "j-function" . "-function" . "''j''-invariant" . "''j''-function" . "modular invariant" . . . . "J-function" .