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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

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    Science Advisor
    Homework Helper

    It means ##A_1 \cup A_2 \cup A_3 \cup \ldots##.
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