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Homework Statement
Find ∪i=0Ai (with infinite symbol) and ∩ i=0Ai (with infinite symbol) in each of the cases when for each natural number
i, Ai is defined as:
1. Ai = {i,−i, i + 1,−(i + 1), i + 2,−(i + 2), . . .}
2. Ai = {0, i, 2i}
3. Ai = {x : x is a real number such that i < x < i + 1}
4. Ai = {x : x is a real number strictly between − i and i}.
Homework Equations
The Attempt at a Solution
I really have no clue on this part of set theory