Question

why we need unfication in big format please​

Answer 1

In order to apply the rules of inference, an inference system must be able to determine when two expressions match. Unification is an algorithm for determining the substitutions needed to make two predicate calculus expressions match.

Answer 2

Answer:

A set of this form can be read as a substitution. If there is no solution the algorithm terminates with ⊥; other authors use "Ω", "{}", or "fail" in that ...