Question: 1. a) Define d(x, y) = l x^(2) - y^(2) l, x, y in R. Is d a metric on R? b) Define d(x, y)

1. a) Define d(x, y) = l x^(2) - y^(2) l, x, y in R. Is d a metric on R? b) Define d(x, y) = l x^(3) - y^(3) l, x, y in R. Is d a metric on R?

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