合一是數理邏輯中的一階謂詞演算使用的一種運算方法。數理邏輯就是以推理(特別是數學中的演繹推理)作為研究對象的學科,它主要是運用數學方法使用數學符號,來研究數學領域公共使用的邏輯推理。而在語言研究中使用“合一”法,就是要用數理邏輯的推理方式來描述語言,達到精確化的目的。
基本介紹
- 中文名:合一
- 外文名:syncretic
簡介
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Prolog 中的合一
- 在傳統Prolog中,未實例化的變數—就是說在它上面以前沒有進行合一,可以合一於一個原子、一個項、或另一個未實例化的變數,因此在效果上變成了它的別名。在很多現代Prolog方言和一階邏輯演算中,變數不能合一於包含它的項;這叫做出現檢查。
- Prolog原子只能合一於同一個原子。
- 類似的,項只能合一於另一個項,如果頂部函式符號和項的元數(arity)和這個項是一樣的,並且參數可以同時合一。注意這是遞歸行為。
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合一的例子
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