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→Undirected and directed graphs
[[Image:Labeled undirected graph.svg|thumb|250px|An undirected graph.]]
[[Image:Labeled undirected graph.svg|thumb|250px|An undirected graph.]]
图：An undirected graph.
一个无向图。
In graph theory an [[undirected graph]] has two kinds of incidence matrices: unoriented and oriented.
In graph theory an [[undirected graph]] has two kinds of incidence matrices: unoriented and oriented.
In graph theory an undirected graph has two kinds of incidence matrices: unoriented and oriented.
In graph theory an undirected graph has two kinds of incidence matrices: unoriented and oriented.
在图论中，'''<font color="#ff8000">无向图 Undirected Graph</font>'''有两种关联矩阵: 无向图和有向图。
图的整圈空间等于其有向关联矩阵的零空间，可以看作是整数或实数或复数上的矩阵。二元循环空间是有向或无向关联矩阵的零空间，可以看作是二元场上的矩阵。
图的整圈空间等于其有向关联矩阵的零空间，可以看作是整数或实数或复数上的矩阵。二元循环空间是有向或无向关联矩阵的零空间，可以看作是二元场上的矩阵。
===Signed and bidirected graphs===
===Signed and bidirected graphs===