Triangle inequality for pretentious distance

The pretentious distance obeys

D (f_{1} f_{2}, g_{1} g_{2}; x) \leq D (f_{1}, g_{1}; x) + D (f_{2}, g_{2}; x) .

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Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 150 / 2 / e / Solution

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