Some questions on representation theory

[arz2000]

Hello all,

Can anybody help me solve the following exercises from the book:
Representation Theory, A first course by William Fulton and Joe Harris,1991

page 138, exercise 10.3
page 140, exercise 10.7
page 141, exercise 10.9

Thanks in Advance,

 

[matt grime]

Write the question out. (As it happens I have a copy of that book - but not necessarily the same version as yours, and it's in my office and at home).