# basic set theory question

by semidevil
Tags: basic, theory
 P: 134 ok, find the intersection of i=1 to infinitie of A(i). A(i) = [0, to 1/i]. I dont understand what it is asking. what do they mean to find the intersection of that? and what if A(i) = [0, 1/n)
 P: 1,572 To use mathematicasque notation, Intersect[A(i), {i,1,oo}] is the set of all points in each A(i). There's only one point in all A(i)'s: 0. Therefore the intersection is {0}. Same with the second one. But if they made it (0,1/i) then it would be empty.
 P: 1,370 Do you mean: $$\bigcap_{i=1}^{\infty} A(i)$$ where A(i) = [0, 1/i]? Wouldn't the answer be {0}?

 Related Discussions Set Theory, Logic, Probability, Statistics 11 Set Theory, Logic, Probability, Statistics 3 Set Theory, Logic, Probability, Statistics 6 Introductory Physics Homework 1 General Math 6