The answers to exercises marked [BB] can he found in the Back of the Book.
True or false? In each case, provide a proof or a counterexample.
(a) A⊆C, 5⊆D→A×5⊆C×D.
(b) A ⊈ B, B ⊆C → A ⊈C.
(c) A×B⊆C×D→A⊆C and B⊆D.
(d) A⊆C and B⊆D if and only if A × B ⊆ C × D.
(e) [BB]A∪B⊆A∩B→A = B.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.