Chapter 9.49, Problem 49.10E

d((x, y), (z, w)) = |xz|+|yw|, show that whether d is a metric on R² or not?. Q3/Let R be a set of real number and d: R² x R² → R such that -> d((x, y), (z, w)) = max{\x - zl, ly - w} show that whether d is a metric on R² or not?. Q4/Let X be a nonempty set and d₁, d₂: XXR are metrics on X let d3,d4, d5: XX → R such that d3(x, y) = 4d2(x, y) d4(x, y) = 3d₁(x, y) +2d2(x, y) d5(x,y) = 2d₁ (x,y))/ 1+ 2d₂(x, y). Show that whether d3, d4 and d5 are metric on X or not?

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