How does this proof of Theorem 1 in Spivak's Calculus work? – math.stackexchange.com

How does this proof of Theorem 1 in Spivak's Calculus work? – math.stackexchange.com

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Hello I just started Spivak's Calculus and I've come across something I don't really understand. What is trying to be proved is $$ |a+b|\leq|a|+|b|\,. $$ The proof is based on the observation that ...

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