| 释义 |
lacunary, a.|ləˈkjuːnərɪ|
[f. lacuna + -ary2; after F. lacunaire.]
1. Of or pertaining to a lacuna; consisting of or resembling lacunæ.
1857E. C. Otté Quatrefages' Rambles Nat. II. 289 Lacunary passages connected these two cavities together. 1868P. M. Duncan Insect World Introd. 14 On reaching the interior of the head it opens in the lacunary inter⁓organic system.
2. Math. lacunary function (see quots.). lacunary space: an area in a plane, every point of which is the affix of a value of the variable for which a given function has no determinate values.
1893Cayley in Q. Jrnl. Math. May 281 A function such as this, existing only for points within a certain region and not for the whole of the infinite plane, is said to be a lacunary function. 1893A. R. Forsyth Theory Functions §87. 141 Weierstrass was the first to draw attention to lacunary functions as they may be called. Ibid. 143 The first step in the construction of a function which shall have any assigned lacunary space. |