How to Write a Direct Proof (Example with Integers: If a|b then a^2|b^2)

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How to Write a Direct Proof

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What a coincidence.
I am currently studying logic in the book "A Logical Introduction to Proof" by Daniel W. Cunningham.
Currently at chapter 3 and today I had this as an exercise, prove (direct proof) that if a|b then a^2|b^2.

patricksalhany
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Great proof. It is so simple, but insightful

MsOops