Question: generated group using two elements

Dear all,

I need your help to compute the multiplicative  group generated by the following two matrices.

A :=  Matrix(2, 2, [[2, 0], [0, 1]]) ;

B := Matrix(2, 2, [[1, 1], [0, 1]]) ;

 such that A.B different to B.A

many thanks

 

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