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Math Help - accumilation points

  1. #1
    Junior Member
    Jul 2006

    accumilation points

    problem 1)
    (a) int (int S) = int S
    (b) cl (cl S) = cl S
    Please write which part of which theorem you have used in each part of your argument.

    problem 2)
    Directly from the definition of accumulation point show that
    (S (upside down U) T)' (is a subset of) S' (upside down U) T'

    Find sets S and T for which
    (S (upside down U) T)' (is not equal to) S' (upside down U) T'
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  2. #2
    Feb 2007
    I have no clue how to do this so im not much help, but I have a definition for you and maybe someone else can figure this out by the definition I give.

    Let S is a subset of R. A point x in R is an accumilation point of S if every deleted neighborhood of x contains a point S.
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