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Matrix Action on Forms

A matrix in SL(2, Z) acts on the right on quadratic forms by the rule

f(x, y) ((r s atop t u)) = f(rx + sy, tx + uy),

which is provided in Magma by the operator *.

f * M : QuadBinElt, GrpMatElt -> QuadBinElt
The action of SL(2, Z) on forms.
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Version: V2.19 of Mon Dec 17 14:40:36 EST 2012