Prove the inequality | x 1 + x 2 + ... + x n | ≤ | x 1 | + | x 2 | + ... + | x n | holds for any n numbers.

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Chapter A.2, Problem 1E

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Prove the inequality |x1+x2+...+xn|≤|x1|+|x2|+...+|xn| holds for any n numbers.

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