| 单词 | root node |
| 释义 | > as lemmasroot node root node n. see sense 15c. root node c. A unique node or vertex of a graph from which every other node can be reached. Also root node. ΘΚΠ the world > relative properties > number > graph or diagram > [noun] > graph > point on lattice point1857 root1857 node1864 vertex1931 1857 A. Cayley in London, Edinb. & Dublin Philos. Mag. 13 172 The inspection of these figures will show at once what is meant by the term in question, and by the terms root, branches,..and knots (which may be either the root itself, or proper knots, or the extremities of the free branches). 1881 Amer. Jrnl. Math. 4 266 In a tree of N knots, selecting any knot at pleasure as a root, the tree may be regarded as springing from this root, and it is then called a root-tree. 1973 C. W. Gear Introd. Computer Sci. vii. 282 A tree is a set of nodes connected by branches such that there is one and only one way of going from one node to another via branch connections, and which has a distinguished node called the root node. 2006 Bull. Symbolic Logic 12 300 Essentially all [iteration games] consist of ‘bad’ playing iteration trees and then ‘good’ picking a branch leading to a well-founded model, which ‘bad’ then uses as the root of a new tree to continue the game. < as lemmas |
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