Prove that the sum of two negative numbers is negative.

*Proof.*Let be negative numbers, i.e., and . By Theorem I.25, . Thus, is negative as well.

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Stumbling Robot

A Fraction of a Dot
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Sum of negatives is negative.

* Proof. * Let be negative numbers, i.e., and . By Theorem I.25, . Thus, is negative as well.

Prove that the sum of two negative numbers is negative.