Congruence Subgroup: Subgroup, Mathematics, Matrix group, Integer, Determinant, Special linear Invertible matrix, Modular arithmetic, Homomorphism, group

Unimodular Matrix: Mathematics, Integer Matrix, Determinant, Cramer's Rule, Group, Matrix Multiplication, Identity...

Modular Group: group, Mathematics, Number theory, Geometry, Abstract algebra, group (mathematics), Matrix...

Projective representation: Mathematics, Representation Theory, Vector Space, Group Homomorphism, Linear Group, Normal...

Transitively Normal Subgroup: Mathematics, Group Theory, Subgroup, (Mathematics), Subgroup