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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
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
if in prolog? - Stack Overflow And it's very essential for you to understand that what is the facts and rulse and differents between together in prolog language programing In Prolog, "if" is implied by using :- in rules The part before :- is the conclusion (head), and the part after :- is the condition (body) Head :- Body This means X is happy if X is rich and X is healthy
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 –
syntax - Prolog or operator, query - Stack Overflow I'm working on some prolog that I'm new to I'm looking for an "or" operator registered(X, Y), Y=ct101, Y=ct102, Y=ct103 Here's my query What I want to write is code that will: "return X, given that Y is equal to value Z OR value Q OR value P" I'm asking it to return X if Y is equal to all 3 though What's the or operator here? Is there one?
What is the logical not in Prolog? - Stack Overflow In Prolog, the "not" is an example of "negation as failure", but it is felt that \+ will make it clearer to the programmer just what precisely is being asserted in any given rule So you CAN use "not" (most PL implementations keep it for backwards-compatibility) but to be an idiomatic modern PL programmer, you probably should prefer to use \+
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
Not equal sign in Visual Prolog? - Stack Overflow Documentation for the second variant pointed out by Kaarel can be found in this Visual Prolog reference page However the problem with your code goes a little deeper You need to wait for testing of non-equality until both terms Person and Sister are bound, so rearrange things like this: