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Math Help - How to express in set builder notation?

  1. #1
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    How to express in set builder notation?

    I have two relations,

    R1: { (copy1, member1), (copy2, member1), (copy3, member2), (copy4, member2) }
    R2: { (copy1, 3), (copy2, 5), (copy3, 6), (copy4, 2) }

    Note: In both R1 and R2, copy# should not repeat.

    I want a set of all copies against "member1" whom due date is less than x, where x belongs to Natural numbers.
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  2. #2
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    Re: How to express in set builder notation?

    Quote Originally Posted by Osman View Post
    I have two relations,

    R1: { (copy1, member1), (copy2, member1), (copy3, member2), (copy4, member2) }
    R2: { (copy1, 3), (copy2, 5), (copy3, 6), (copy4, 2) }
    Note: In both R1 and R2, copy# should not repeat.
    I want a set of all copies against "member1" whom due date is less than x, where x belongs to Natural numbers.
    Should it be R_2=\{(c_1,m_3),(c_2,m_5),(c_3,m_6),(c_4,m_2)\}~?

    But you have written R_2=\{(c_1,3),(c_2,5),(c_3,6),(c_4,2)\}
    That is different than the format from R_1.
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