Witness (Mathematics): Mathematical Logic, Existential Quantification, Computable Set, Logical Equivalence, Predicate Calculus, Gödel's Completeness Theorem

Uniqueness Quantification: Mathematics, Logic, Mathematical Quantification, Existential Quantifier

Attributional Calculus: Predicate Logic, Propositional Calculus, Multi Valued Logic

Squeeze Theorem: Calculus, Theorem, Limit (Mathematics)

Skolem Normal Form: Existential Quantification, Automated Theorem Prover, Formula, First order Logic, Thoralf