If A - B - C - D and A - B - - prove that A - C and B - D-

Let: #160;(x, #160;y) #160; #8712;(A #215;B) #8756; #160;x #8712;A, #160;y #8712;BNow, #8757;(A #215;B) #8838;(C #215;D) #160; # ...

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De Morgan's Law

If A × B ⊆ C ...

Question

If A × B ⊆ C × D and A × B ≠ ϕ, prove that A ⊆ C and B ⊆ D.

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