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Question: how to prove thm 152 amp corllary 1521...

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How to prove Thm 1.52 & Corllary 1.52.1

Publishable Theorem 1.52 (Triangle Inequality) Let x,y e R. Then Ix+ S y. Publishable Corollary 1.52.1 Let r. y E R. Th en Ixl-ly| |x-v1.

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