a) If P intertwine X and D, show that P is square and nonsingular
b) Assume that F is algebraically closed and P and Q both intertwine X and D. show that Q = P for some F
bài 2:: let G be a group and F a field of characteristic p. Suppose |G| p and show that F[G] is not semisimple.
bài 3::G is a Abelian group. show that (EndG,.) G
bài 4::Find all irreducible representations of the cyclic group C_{p}, C_{p.q}, p, q prime.
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