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### Function

jInvariant ( seq(elt-fld^com) L ) -> elt-fld^com

### Description

<shortdoc> The value of the modular j-function for the lattice L = [a,b], defined by j([a,b]) = j(tau) where tau is a/b or b/a, whichever is in the upper half plane. </shortdoc>

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