Prove that .

*Proof.*By Theorem I.3 we have . Then, using I.3.3, Exercise #5 we have,

By Theorem I.4, , so

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Stumbling Robot

A Fraction of a Dot
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Prove -(a-b) = -a+b

* Proof. * By Theorem I.3 we have . Then, using I.3.3, Exercise #5 we have,

Prove that .

By Theorem I.4, , so