Question (1.6): Wrirte out all ways in which one can form a product of four elements a,b,c,d in the given order.

Question (6.5): Justify (6.15) carefully

(6.15) is: et f: G --: G' be a homomorphism of finite groups, then |G| = |ker F||Im F|.

Thus |ker F| divides |G| and |Im F| both |G| and |G'|.

Tonio

Pd. You better get a copy of Artin's book in the school's library ...or in gigapedia.org.