MathCastle
Groups and FieldsHardGroup Actions

Group Actions · Hard problem

GL(2,Z3)GL(2,\mathbb Z_3), the invertible 2×22\times2 matrices with entries mod 33, acts on the 88 nonzero vectors of Z32\mathbb Z_3^2 by M⋅v=Mv mod 3M\cdot v=Mv\bmod3. Given ∣GL(2,Z3)∣=48|GL(2,\mathbb Z_3)|=48 and that this action is transitive, find ∣Stab⁡((1,0))∣|\operatorname{Stab}((1,0))|.