Common use of UNIFICATION Clause in Contracts

UNIFICATION. As demonstrated in the previous section, one of the main ingredients in the inference mechanism is the process of making two atomic formulas syntactically equivalent. Be- fore defining the notion of SLD-resolution we focus on this process, called unification, and give an algorithmic solution — a procedure that takes two atomic formulas as input, and either shows how they can be instantiated to identical atoms or, reports a failure. Before considering the problem of unifying atoms (and terms), consider an ordinary equation over the natural numbers (N) such as: 2x +3 =.