Question: 2. Prove that for any integer n 1, and any set of n real numbers {x1,. . . Xn} |x1 + . . .

2. Prove that for any integer n 1, and any set of n real numbers {x1,. . . Xn} |x1 + . . . + xn| |x1|+ . . . + |xn|. Can you identify exactly in which cases equality hold for n = 2 (i.e., the triangle inequality)?

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