we have the following WFF of the quantificational calculus: ƎxƎy∀z (p(z) ∧ q(x,y) <-> (r(w) ∧ ∀w S(w,y))) How many occurrences does x,y,z and w have? and why  How many bound and free occurrences does x,y,z and w have? and why I posted this question before but the answer is wrong. Thanks

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Predicates

A predicate is a function defined with set of variables, which returns the result True or False. The output of a predicate is a Boolean value as a response when given a set of parameters: