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Math Help - List the (distinct) elements in each of the following set:

  1. #1
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    List the (distinct) elements in each of the following set:

    I am not sure what these problems are requesting. I have watched Discrete Math videos and read my textbook, still unable to arrive at the answers.

    List the (distinct) elements in each of the following set:
    1e.) {aN | a < -4 and a > 4}

    Let A = {(-1,2), (4,5), (0,0), (6,-5), (5,1), (4,3)}
    List the elements in each of the following sets.
    3b.) {a | a > 0 and (a,b) A for some b}

    4.) List the elements in the sets A={a,b) N x N | a≤b, b≤3} and B={a/b {-1,1,2} }.
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  2. #2
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    Re: List the (distinct) elements in each of the following set:

    Quote Originally Posted by rtrumpow View Post
    I am not sure what these problems are requesting. I have watched Discrete Math videos and read my textbook, still unable to arrive at the answers.

    List the (distinct) elements in each of the following set:
    1e.) {aN | a < -4 and a > 4}
    You can't, strictly speaking, list the elements because there are an infinite number of them. Is it possible that the problem actually said "a> -4" and "a< 4"? In addition, "N" usually means the positive integers. If that is the case here, the reference to "-4" is irrelevant.

    Let A = {(-1,2), (4,5), (0,0), (6,-5), (5,1), (4,3)}
    List the elements in each of the following sets.
    3b.) {a | a > 0 and (a,b) A for some b}
    The only requirement is that "a> 0" and only (-1, 2) and (0, 0) don't satisfy that.

    4.) List the elements in the sets A={a,b) N x N | a≤b, b≤3} and B={a/b {-1,1,2} }.
    If " a\le b", a/b can't be 2. And "a/b= -1" isn't possible for for a and b both positive numbers. That leaves only "a/b= 1" and b can only be 1, 2, or 3.
    Last edited by HallsofIvy; March 13th 2013 at 09:09 AM.
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    Re: List the (distinct) elements in each of the following set:

    Question 1e.) is accurate. I verified with the textbook that I did not switched the signs.
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