1. ## Proving set theories

If A,B,C,D are sets, is (A U B) X (C U D)= (A X C) U (B X D).

how can i decide if this is a true statement?

2. Originally Posted by nikie1o2
if a,b,c,d are sets, is (a u b) x (c u d)= (a x c) u (b x d). How can i decide if this is a true statement?
false.
$A=\{1\},~B=\{2\},~C=\{3\},~D=\{4\}$.

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### (aub)x(cud)

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