For example, if I wanted to make a set of all $x$'s that satisfied some predicate function $f(x, y)$ with exactly 2 different values of $y$, is this a legal statement:
$\{x |\ |(\forall y)(f(x, y))|=2 \}$
2026-02-25 12:23:18.1772022198
Is it legal to use the cardinality of a universal quantifier in relational calculus?
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