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Math Help - closed under subtraction

  1. #1
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    closed under subtraction

    how do i prove that for any a,b in Z, the set L sub(a,b) is closed under subtraction
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  2. #2
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    Quote Originally Posted by alyssams View Post
    how do i prove that for any a,b in Z, the set L sub(a,b) is closed under subtraction

    It'd be a very good idea if you'd tell what in the world is Lsub(a,b)...

    Tonio
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  3. #3
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    sorry, La,b is (ax+by:x,y element of Z)
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  4. #4
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    (ax+by)-(ax'+by') = a(x-x')+b(y-y)'\in L_{a,b}?
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