Congruence Subgroups and Rational Conformal Field Theory
نویسنده
چکیده
We address here the question of whether the characters of an RCFT are modular functions for some level N , i.e. whether the representation of the modular group SL2(Z) coming from any RCFT is trivial on some congruence subgroup. We prove that if the matrix T , associated to (
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