Find and if for every positive integer i,
a) Ai = {−i, –i + 1,...,–1, 0, 1,....,i –1, i}.
b) A, = {−i, i}
c) Ai- = [–i, i], that is, the set of real numbers x with –i ≤ x ≤ i.
d) Ai = [i, ∞), that is, the set of real numbers x with x ≥ i.
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