Question: 1. (10 points) Let X = [1, +co) and define the function d : X x X - R as follows: 0 x = y,

1. (10 points) Let X = [1, +co) and define the

function d : X x X - R as follows: 0 x

1. (10 points) Let X = [1, +co) and define the function d : X x X - R as follows: 0 x = y, d(x, y = (1) 1+ xy x y. Prove that d is a metric

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