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Incidence poset : ウィキペディア英語版 | Incidence poset In mathematics, an incidence poset or incidence order is a type of partially ordered set that represents the incidence relation between vertices and edges of an undirected graph. The incidence poset of a graph ''G'' has an element for each vertex or edge in ''G''; in this poset, there is an order relation ''x'' ≤ ''y'' if and only if either ''x'' = ''y'' or ''x'' is a vertex, ''y'' is an edge, and ''x'' is an endpoint of ''y''. ==Example== As an example, a zigzag poset or ''fence'' with an odd number of elements, with alternating order relations ''a'' < ''b'' > ''c'' < ''d''... is an incidence poset of a path graph.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Incidence poset」の詳細全文を読む
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