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Sigma KEE - SubstringFn
KB Term: 
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SubstringFn
(SubstringFn ?SymbolicString ?NonnegativeInteger-1 ?NonnegativeInteger-2) denotes a string that is a subString of ?SymbolicString, begins with the Character at the index ?NonnegativeInteger-1, and ends with the Character at the index (SubtractionFn ?NonnegativeInteger-2 1). The first Character in ?SymbolicString is denoted by the index 0. If the value of ?NonnegativeInteger-1 or ?NonnegativeInteger-2 is greater than the value of (StringLengthFn ?SymbolicString), or if ?NonnegativeInteger-1 is greater than ?NonnegativeInteger-2, the result of evaluating the SubstringFn expression is undefined. Example: (equal "Charle" (SubstringFn "Charles Darwin" 0 6)).
Relationships      
InstancesabstractProperties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment.
 entityThe universal class of individuals. This is the root node of the ontology.
 functionA Function is a term-forming Relation that maps from a n-tuple of arguments to a range and that associates this n-tuple with at most one range element. Note that the range is a SetOrClass, and each element of the range is an instance of the SetOrClass.
 inheritable relationThe class of Relations whose properties can be inherited downward in the class hierarchy via the subrelation Predicate.
 partial valued relationA Relation is a PartialValuedRelation just in case it is not a TotalValuedRelation, i.e. just in case assigning values to every argument position except the last one does not necessarily mean that there is a value assignment for the last argument position. Note that, if a Relation is both a PartialValuedRelation and a SingleValuedRelation, then it is a partial function.
 quaternary relationQuaternaryRelations relate four items. The two subclasses of QuaternaryRelation are QuaternaryPredicate and TernaryFunction.
 relationThe Class of relations. There are three kinds of Relation: Predicate, Function, and List. Predicates and Functions both denote sets of ordered n-tuples. The difference between these two Classes is that Predicates cover formula-forming operators, while Functions cover term-forming operators. A List, on the other hand, is a particular ordered n-tuple.
 single valued relationA Relation is a SingleValuedRelation just in case an assignment of values to every argument position except the last one determines at most one assignment for the last argument position. Note that not all SingleValuedRelations are TotalValuedRelations.
 ternary functionThe Class of Functions that require exactly three arguments.
Belongs to Class entity


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