20. Let |I.ll be a norm on a vector space V, and define, for each ordered pair called the distance between a and y. Prove the following results for all r, y,z E V (a) d(x, y) 2
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20. Let |I.ll be a norm on a vector space V, and define, for each ordered pair called the distance between a and y. Prove the following results for all r, y,z E V (a) d(x, y) 2
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