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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Originally Posted by alyssams 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
sorry, La,b is (ax+by:x,y element of Z)
$\displaystyle (ax+by)-(ax'+by') = a(x-x')+b(y-y)'\in L_{a,b}$?
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