for all sets, A B and C. is this statement true? (A - B) - C = A - (B - C)
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Originally Posted by brudman for all sets, A B and C. is this statement true? (A - B) - C = A - (B - C) Note that . Since we're dealing with intersections, we see that So it appears that (this is reasonable, because "subtraction" isn't associative). Does this make sense?
yes it does, thank you
BTW. If I were your professor, I would expect you to give a counter-example. That is the proper method of showing a statement is false.
This isn't a question from my professor, i just wanted to know if it is true or not
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