- cycle matroid
- 循環矩陣胚, 圈擬陣
English-Chinese dictionary. 2013.
English-Chinese dictionary. 2013.
Matroid — In combinatorics, a branch of mathematics, a matroid ( /ˈmeɪ … Wikipedia
Bicircular matroid — In in the mathematical subject of matroid theory, the bicircular matroid of a graph G is the matroid B ( G ) whose points are the edges of G and whose independent sets are the edge sets of pseudoforests of G , that is, the edge sets in which each … Wikipedia
Greedoid — In combinatorics, a greedoid is a type of set system. It arises from the notion of the matroid, which was originally introduced by Whitney in 1935 to study planar graphs and was later used by Edmonds to characterize a class of optimization… … Wikipedia
Biased graph — In mathematics, a biased graph is a graph with a list of distinguished circles (edge sets of simple cycles), such that if two circles in the list are contained in a theta graph, then so is the third circle of the theta graph. A biased graph is a… … Wikipedia
Signed graph — In the area of graph theory in mathematics, a signed graph is a graph in which each edge has a positive or negative sign.Formally, a signed graph Sigma; is a pair ( G , sigma;) that consists of a graph G = ( V , E ) and a sign mapping or… … Wikipedia
Wheel graph — infobox graph name = Wheel graph image caption = Several examples of wheel graphs vertices = n edges = 2( n − 1) chromatic number = 3 if n is odd 4 if n is even chromatic index = In the mathematical discipline of graph theory, a wheel graph W n… … Wikipedia
Pseudoforest — A 1 forest (a maximal pseudoforest), formed by three 1 trees In graph theory, a pseudoforest is an undirected graph[1] in which every connected component has at most one cycle. That is, it is a system of vertices and edges connecting pairs of ve … Wikipedia
Dowling geometry — In combinatorial mathematics, a Dowling geometry, named after Thomas A. Dowling, is a matroid associated with a group. There is a Dowling geometry of each rank for each group. If the rank is at least 3, the Dowling geometry uniquely determines… … Wikipedia
Duality (mathematics) — In mathematics, a duality, generally speaking, translates concepts, theorems or mathematical structures into other concepts, theorems or structures, in a one to one fashion, often (but not always) by means of an involution operation: if the dual… … Wikipedia
Dual graph — G′ is the dual graph of G In mathematics, the dual graph of a given planar graph G is a graph which has a vertex for each plane region of G, and an edge for each edge in G joining two neighboring regions, for a certain embedding of G. The term… … Wikipedia
W. T. Tutte — William Thomas Tutte (May 14 1917 ndash; May 2 2002) was a British, later Canadian, codebreaker and mathematician. During World War II he broke a major German code system, which had a significant impact on the Allied invasion of Europe. He also… … Wikipedia