10.18 Let (1, p) be a metric space. Prove each of the following facts.

, \p(x, y) - p(z,y)| ≤ p(3,2).

€, p(₁, ₂) ≤ p(22,3₂) + p(2223)++(²-²).

a) For a,y,z

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b) For

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