| 释义 |
bivalence|ˈbɪvələns, ˌbaɪˈveɪləns|
[f. bivalent a.; see -ence.]
In various subjects: the quality of being bivalent; bivalency; spec. in Logic, principle of bivalence (see quots.).
1889Cent. Dict., Bivalence (Chem.), a valence or saturating power which is double that of the hydrogen atom. 1909Ibid. Suppl., Bivalence of the chromosomes, the double as distinguished from the single (univalent) condition of the chromosomes, for example, in the oöcytes and spermatocytes of one of the forms of Ascaris megalocephala. 1951J. ᴌukasiewicz Aristotle's Syllogistic iv. 82 The so-called principle of bivalence, which states that every proposition is either true or false, i.e. that it has one and only one of two possible truth-values: truth and falsity. 1962W. & M. Kneale Devel. Logic ii. 47 The principle that every statement is true or false is called the Principle of Bivalence. |