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3. Let P, Q and R be sets, P ? R, Q ? R. Are the following expressions true or false? Explain why. (a) P
3. Let P, Q and R be sets, P ? R, Q ? R. Are the following expressions true or false? Explain why.
(a) P = (P ? Q) P
(b) P ? Q = (P Q) ? Q
(c) (P ? Q)^C = P^C ? Q^C
(d) P ? R = P
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SQL Instant Reference
Authors: Gruber, Martin Gruber
2nd Edition
0782125395, 9780782125399
