Maybe its my flu...but what do you mean exactly? What I said are two definitions out of the book.
Do I have to show that a^-1b^-1 is one cycle and that ab is another cycle?
Homework Statement
Let a and b belong to Sn. Prove that (a^-1)(b^-1)(a)(b) is an even permutation.
Homework Equations
Definitions I have are
Every permutation in Sn, n>1 is a product of 2 cycles
and
A permutation that can be expressed as a product of an even number of 2 cycles is...