Set Theory Abstract Algebra

• May 23rd 2010, 01:11 PM
matrix10
Set Theory Abstract Algebra
• May 23rd 2010, 03:19 PM
Plato
Here is a hint for #2.
If the bijection $\alpha :S \leftrightarrow S$ is it true that $\alpha \circ \alpha ^{ - 1} = \alpha ^{ - 1} \circ \alpha ?$.