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Math Help - Interior, Boundary, and Closure of Sets

  1. #1
    Junior Member
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    Aug 2009
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    Interior, Boundary, and Closure of Sets

    I don't know how to solve these.



    Heres the problem:

    Find the interior, boundary, and closure of each set gien below. Then determine whether the given set is open, closed, both, or neither. Find the set of accumulation points, if any, of the set.

    A. {1/n : n in the set of N}

    B. N

    C. [0,3] union (3,5)

    D. {x in the set of R^3 : 0 less than or equal to 2 norm of x less than 9}

    E. intersection from n=1 to infinity of (-1/n , 1/n)

    F. union from n=1 to infinity of (-1/n , 1/n)

    G. N^3, which is defined to be {(x,y,z) : x,y,z in the set of N}
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  2. #2
    Junior Member
    Joined
    Aug 2009
    Posts
    34
    Does anyone know how to do these problems? The help is greatly
    appreciated.
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