(Triangle inequality) ∀x, y ∈ R : |x + y| ≤ |x| + |y|. Proof. Exercise. Use that |x| = max{x, −x}.
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(Triangle inequality) ∀x, y ∈ R : |x + y| ≤ |x| + |y|. Proof. Exercise. Use that |x| = max{x, −x}.
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