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Homework Statement
In an ordered ring, show that
If a>0, b>0, then a>b <--> (a^2)>(b^2).
Hint: [(b^2)-(a^2)] = (b-a)(b+a). Use Rule of Signs.
Homework Equations
Rule of Signs?
The Attempt at a Solution
I don't know how to use the hint and I'm having trouble with the proof, as this is my first proofs class.