MathCastle
Groups and FieldsSuperchallengeNormal Subgroups and Quotient Groups

Normal Subgroups and Quotient Groups · Superchallenge problem

What is the order of SL(2,Z5)/{±I}SL(2,\mathbb Z_5)/\{\pm I\} (the quotient by the center of SL(2,Z5)SL(2,\mathbb Z_5))?