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What does \+ mean in Prolog? - Stack Overflow The way I memorize it is through the following logical rule: \+ = 'if unsure or false, assume false' This is different from standard boolean logic in that if your goal is uncertain instead of outright true or false, it assumes false when it can't prove true
Whats the - gt; operator in Prolog and how can I use it? Not sure if that's worth it! I mean, especially if the preconditions become slightly more complex, this may get messy As for backtracking: for this version (SWI-)prolog does not immediately return to the prompt on implication(a) and implication(b), so indeed some backtracking will be attempted –
What is the difference between == and = in Prolog? The = "operator" in Prolog is actually a predicate (with infix notation) = 2 that succeeds when the two terms are unified Thus X = 2 or 2 = X amount to the same thing, a goal to unify X with 2 The == "operator" differs in that it succeeds only if the two terms are already identical without further unification
prolog - Relational Logic Programming in Python? - Stack Overflow Pyke introduces a form of Logic Programming (inspired by Prolog) to the Python community by providing a knowledge-based inference engine (expert system) written in 100% Python Unlike Prolog, Pyke integrates with Python allowing you to invoke Pyke from Python and intermingle Python statements and expressions within your expert system rules
Prolog: Making a procedure to print Hello World - Stack Overflow You need to name the procedure write, not Write Upper case starting letters are for variables (It might be less confusing if you call it something else like writeHi or something, so it doesn't have the same name as a built-in procedure, but it will still work when you call it write because your write has a different arity than the built in one)
logic - Prolog arrow operator - Stack Overflow Looking at the if-then-else construct, the description given in the GNU Prolog manual says:-> 2 is often combined with ; 2 to define an if-then-else as follows: Goal1 -> Goal2 ; Goal3 Note that Goal1 -> Goal2 is the first argument of the (;) 2 and Goal3 (the else part) is the second argument
prolog - What are the best uses of Logic Programming . . . - Stack Overflow When choosing a Prolog system, the power and performance of its constraint solvers are often among the deciding factors, especially for commercial users CLP(FD) — Reasoning over integers In practice, CLP(FD) is one of the most imporant applications of logic programming, and is used to solve tasks from the following areas, among others:
In Prolog, is a fact the same as a functor? - Stack Overflow Prolog's use of functors to express facts (and rules) makes it a fairly slick and powerful metaprogramming environment Prolog has a special built-in predicate (operator = ) called univ that unpacks a compound term into a list whose head is the principal functor's name and whose remaining items are the arguments given to that functor in the