Narrowing By Exclusion Of Dependent Values
Narrowing may refer to: *Narrowing (computer science), a type of algorithm for solving equations between symbolic expressions **Narrowing of algebraic value sets, a method for the elimination of values from a solution set which are inconsistent with the equations being solved *Narrowing (historical linguistics), a type of semantic change *Collisional narrowing of a spectral line due to collisions of the emitting species *Motional narrowing of a resonant frequency due to the inhomogeneity of the system averaging out over time *Perceptual narrowing, a process in brain development *Q-based narrowing, a concept in pragmatics *Stenosis, the narrowing of a blood vessel or other tubular organ See also

*Narrow (other) {{Disambiguation ...
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Narrowing (computer Science)
In logic and computer science, specifically automated reasoning, unification is an algorithmic process of solving equations between symbolic expression (mathematics), expressions, each of the form ''Left-hand side = Right-hand side''. For example, using ''x'',''y'',''z'' as variables, and taking ''f'' to be an uninterpreted function, the Singleton (mathematics), singleton equation set is a syntactic first-order unification problem that has the substitution as its only solution. Conventions differ on what values variables may assume and which expressions are considered equivalent. In first-order syntactic unification, variables range over first-order terms and equivalence is syntactic. This version of unification has a unique "best" answer and is used in logic programming and programming language type system implementation, especially in Hindley–Milner based type inference algorithms. In higher-order unification, possibly restricted to higher-order pattern unification, terms may ...
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