Mathematics
Mathematics, 22.01.2020 23:31, redthangracing

Find {\bigcup}^{\infty}_{i=1} a_i and \bigcap^{\infty}_{i=1}[t ex]a_i[/tex] if for every positive integer i,
a) a_i = {−i,−i+−1,0,−1,i}.
b) a_i = −i, i.
c) a_i = [−i, i], that is, the set of real numbers x with −i ≤ x ≤ i.
d) a_i = [i,[infinity]], that is, the set of real numbers x with x ≥ i.

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Find [tex]{\bigcup}^{\infty}_{i=1}[/tex] [tex]a_i[/tex] and [tex]\bigcap^{\infty}_{i=1}[/tex][t ex]a...

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