Let X, Y , and Z be sets with elements from a universe U. Show that the sets (X..Y )\Z and X\(Y [Zc)c
are equal.
A universe is a set that satisfies the following conditions ;
(ů) x€y€Ů implies X€Ů
(Ů) x,y € Ů implies {X,y} €Ů
(Ů) x€ Ů implies €(x) €Ů
(ů) I € Ů and a map I>ů,i>X the union Ůi€lx is in Ů
X€Y€z.....y(zc)€ X
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