Determine the centralizer and the order of the conjugacy, Mathematics

Determine the centralizer and the order of the conjugacy:

1)      Determine the centralizer and the order of the conjugacy class of the matrix [1, 1; 0, 1] in Gl­2(F3).

2)      Prove that the icosahedral group has a subgroup of order 10.

3)      Let G be a group of order n which acts nontrivially on a set of order r. Prove that if n>r!, then G has a proper normal subgroup.

4)      Determine the conjugacy classes in the dihedral group D10 and write down the class equation for this group. Find the center of D10.

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