Logic programming

Logic programming is using mathematical logic to write computer programs. There are specialized programming languages where the user can directly enter logical statements. Probably the best-known of these languages is called Prolog. Alonzo Church used a form of logic programming in what is known as lambda calculus today. Logic programming has also been used in LISP. 
Programs consist of a set of rules and facts. In most cases, logic programming uses what is called negation as failure or "weak negation:" This means that if it is not possible to derive some clause formula_1 from the facts and rules, the system will assume that its negation is true.