1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Interval Proof

  1. Oct 4, 2016 #1
    1. The problem statement, all variables and given/known data
    Let ##A_n = (n − 1, n + 1)##, for all natural numbers n. Find, with proof, ##∪_{n≥1}A_n##

    2. Relevant equations
    What does that last statement mean? Union for n greater than or equal to one times the interval?

    3. The attempt at a solution
    I can't understand the question.
  2. jcsd
  3. Oct 4, 2016 #2

    Ray Vickson

    User Avatar
    Science Advisor
    Homework Helper

    It means ##A_1 \cup A_2 \cup A_3 \cup \ldots##.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted