A absvalue New member Joined Sep 17, 2009 Messages 3 Sep 23, 2009 #1 Sorry if this is in the wrong place. I couldn't find a discrete math section. I need to prove that A is a subset of B if and only if A - B = the empty set. I'm a little lost at how to do this... could someone point me in the right direction?
Sorry if this is in the wrong place. I couldn't find a discrete math section. I need to prove that A is a subset of B if and only if A - B = the empty set. I'm a little lost at how to do this... could someone point me in the right direction?
F fasteddie65 Full Member Joined Nov 1, 2008 Messages 360 Sep 24, 2009 #2 If A - B = ø, when A = B. Therefore, A is a subset of B, but not a proper subset.
