Question
Find a countermodel for each of the following wffs. a. p(c) x p(x). b. x p(x) x p(x). c. x (p(x) q(x)) x p(x) x
Find a countermodel for each of the following wffs.
a. p(c) x p(x).
b. x p(x) x p(x).
c. x (p(x) q(x)) x p(x) x q(x).
d. x p(x) x q(x) x (p(x) q(x)).
e. x y p(x, y) y x p(x, y).
f. x (p(x, f (x)) p(x, y)).
g. (x p(x) x q(x)) x (p(x) q(x)).
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Concepts of Database Management
Authors: Philip J. Pratt, Joseph J. Adamski
7th edition
978-1111825911, 1111825912, 978-1133684374, 1133684378, 978-111182591
