| 单词 | normal form | 
| 释义 | > as lemmasnormal form   normal form  n. Philosophy a standard structure or format in which all propositions in a (usually symbolic) language can be expressed, and to which other forms can be reduced. ΚΠ 1948    Mind 57 173  				He [sc. Boole] introduced two notions which are of the greatest importance, namely, that of a truth-function and that of a normal form. 1950    L. M. Hammond  et al.  tr.  D. Hilbert  & W. Ackermann Princ. Math. Logic i. §3. 12  				Any combination of sentences can be brought into a certain normal form by means of equivalence transformations. 1996    S. Blackburn Oxf. Dict. Philos. 265/1  				A well-formed formula of the propositional calculus is in conjunctive normal form when it is of the form A & B &..where each of A, B..is a formula consisting of a disjunction of atomic propositions. < as lemmas | 
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