1788, in linguistics, from Greek di- "twice" (see di- (1)) + -graph "something written," from Greek graphe "writing," from graphein "to write, express by written characters," earlier "to draw, represent by lines drawn" (see -graphy). In mathematics, from 1955, a contraction of directed graph.
实用例句
1. A digraph D is unilateral.
有向图D是单连的.
来自辞典例句
2. We shall abbreviate'directed graph'to digraph.
我们将把“有方向的图”简称为方向图.
来自辞典例句
3. A digraph D is hamiltonian if D contains a hamilton directed cycle.
如果D中含有一个哈密尔顿有向圈,则称D为哈密尔顿有向图.
来自互联网
4. There fore we study the kings of locally semicomplete digraph by its characterization.
