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Craig interpolation ^{en}
In mathematical logic, Craig's interpolation theorem is a result about the relationship between different logical theories. Roughly stated, the theorem says that if a formula φ implies a formula ψ then there is a third formula ρ, called an interpolant, such that every nonlogical symbol in ρ occurs both in φ and ψ, φ implies ρ, and ρ implies ψ. The theorem was first proved for firstorder logic by William Craig in 1957. Variants of the theorem hold for other logics, such as propositional logic. A stronger form of Craig's theorem for firstorder logic was proved by Roger Lyndon in 1959; the overall result is sometimes called the Craig–Lyndon theorem. [  ]
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 Craig interpolation
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Topic equivalent webpage
 http://en.wikipedia.org/wiki/index.html?curid=2056790
 http://ja.wikipedia.org/wiki/クレイグの補間定理
 http://en.wikipedia.org/wiki/Craig_interpolation
 http://de.wikipedia.org/wiki/CraigInterpolation
 http://ko.wikipedia.org/wiki/크레이그의_보간_정리
 http://ko.wikipedia.org/wiki/%ED%81%AC%EB%A0%88%EC%9D%B4%EA%B7%B8%EC%9D%98_%EB%B3%B4%EA%B0%84_%EC%A0%95%EB%A6%AC
 http://ko.wikipedia.org/wiki/index.html?curid=701016
 http://pl.wikipedia.org/wiki/index.html?curid=12201
 http://ja.wikipedia.org/wiki/%E3%82%AF%E3%83%AC%E3%82%A4%E3%82%B0%E3%81%AE%E8%A3%9C%E9%96%93%E5%AE%9A%E7%90%86
 http://pl.wikipedia.org/wiki/Twierdzenie_Craiga
 
 
 
 
 
 

 
 