Discussion
What is skolemisation?
Answer: A
Skolemisation replaces each existential variable by a term built from a fresh function symbol applied to the enclosing universal variables, which removes the existential quantifiers while preserving satisfiability. It is a step in converting to clausal form. Universal removal, normal form conversion and standardising apart are the neighbouring steps. Preserving satisfiability rather than equivalence is the subtlety, and it is exactly what a refutation procedure needs.
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