| 释义 |
dyadic, a. (n.)|daɪˈædɪk|
[ad. Gr. δυαδικ-ός of the number two.]
Of or pertaining to a dyad or group of two. dyadic arithmetic: binary arithmetic, in which the radix is 2. dyadic disyntheme: see duadic.
1727–51Chambers Cycl. s.v. Arithmetic, Binary or Dyadic Arithmetic is that, wherein only two figures, unity, or 1, and 0, are used. 1800Monthly Mag. X. 43 The dyadic arithmetic proposes to express all numbers by two characters, 1 and 0... Thus, 1 is represented by 1, 2 by 10, 4 by 100, and 8 by 1000. 1882Schaff Encycl. Relig. Knowl. III. 2395 Up to 360, the whole development [of the doctrine of the Trinity] was markedly dyadic.
b. Chem. Of the atomic constitution of a dyad.
1873Fownes' Chem. 395 Cadmium, like zinc, is dyadic.
B. n.
1. = dyadic arithmetic.[1845J. M. Mackie Leibnitz 187 Leibnitz invented the Dyadik or reckoning with zero and unity.] 2. Math. Any quantity formed by the addition or subtraction (or both) of dyads.
1884J. W. Gibbs Coll. Wks. (1928) II. ii. iii. 53 An expression consisting of any number of dyads united by the signs + or - will be called a dyadic binomial, trinomial etc.,..or, more briefly, a dyadic. The latter term will be used so as to include the case of a single dyad. 1924C. E. Weatherburn Adv. Vector Anal. v. 81 Then r′ = r·ai + r·bj + r·ck. We write this more briefly r′ = r·(ai + bj + ck), where the expression in brackets is an operator called a dyadic. 1969Ll. G. Chambers Course Vector Anal. vi. 189 Dyadics may be formed in which the vector operator ∇ is a component part.
Add: Also (rare) diadic. [A.] 2. Logic. Pertaining to or designating a relation between exactly two entities, or a predicate expressing such a relation. Also used transf., esp. in Math. and Computing, to designate any expression, operator, etc. which requires or acts on two arguments.
1897C. S. Peirce in Monist VII. 167 An ordinary relative with an active verb as ‘—is a lover of—’ or ‘the loving by—of—’ has two blanks; it is a dyad, or dyadic relative. 1906, etc. [see polyadic a.]. 1921Diadic [see monadic a. 1 b]. 1955A. N. Prior Formal Logic iv. 85 We may..construct monadic and dyadic predicates out of triadic ones. 1962Gloss. Terms Automatic Data Processing (B.S.I.) 28 Dyadic operation, an operation on two operands. 1982IEEE Trans. Antennas XXX. 1003/2 We found dyadic Green functions convenient in deriving variationally invariant expressions for the scattering amplitude.
[B.] [2.] (Example of variant spelling.)
1889Diadic [see uniplanar a. 1]. |