Congruence subgroup

（重定向自Principal congruence subgroup）

In mathematics, a congruence subgroup of a matrix group with integer entries is a subgroup defined by congruence conditions on the entries. A very simple example would be invertible 2×2 integer matrices of determinant 1, such that the off-diagonal entries are even.

单词	Principal congruence subgroup
释义	Principal congruence subgroup 英语百科 Congruence subgroup （重定向自Principal congruence subgroup） In mathematics, a congruence subgroup of a matrix group with integer entries is a subgroup defined by congruence conditions on the entries. A very simple example would be invertible 2×2 integer matrices of determinant 1, such that the off-diagonal entries are even.
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