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## Homework Statement

a) Find: [tex]\bigcup_{i=1}^{\infty}} A_i[/tex]

b) Find: [tex]\bigcap_{i=1}^{\infty}} A_i[/tex]

Where [itex]A_i[/itex] = (0,i), that is, the set of real numbers x with 0 < x < i

I was doing okay when they gave me [itex]A_i[/itex] = {i, i+1, i+2, ...}, but now that they're giving me (0,i), and introducing x, I'm getting confused.