Prove: For all π, σ ∈ Sn, (π ◦ σ)−1 = σ−1 ◦ π−1.   Please show the full proof and not just an example. Also note ◦ is not a multiplication sign. It's a composition sign.   Thank you!

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.1: Postulates For The Integers (optional)
Problem 26E: Prove that the cancellation law for multiplication holds in Z. That is, if xy=xz and x0, then y=z.
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Prove: For all π, σ ∈ Sn, (π ◦ σ)−1 = σ−1 ◦ π−1.

 

Please show the full proof and not just an example. Also note ◦ is not a multiplication sign. It's a composition sign.

 

Thank you!

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