1(i) Show, if (X, d) is a metric space, then d∗ : X × X → [0,∞)defined by d∗(x, y) = d(x, y) /1 + d(x, y) is a metric on X. Feelfree to use the fact: if a, b are nonnegative real numbers and a ≤b, then a/1+a ≤ b/1+b .
1(ii) Suppose A ⊂ B ⊂ R. Show, if A is not empty and B isbounded below, then both inf(A) and inf(B) exist and moreover,inf(A) ≥ inf(B).
