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第302行： − + − 关联矩阵的定义适用于有圈和多边的图。对应于一个循环的有向关联矩阵的列都是零，除非这个图是带符号的，而且循环是负的; 那么这个列除了其关联顶点行的 ± 2之外都是零。+ − −
→Multigraphs
===Multigraphs===
===Multigraphs===
'''<font color="#ff8000">多重图 Multigraphs</font>'''
The definitions of incidence matrix apply to graphs with [[loop (graph theory)|loops]] and [[multiple edges]]. The column of an oriented incidence matrix that corresponds to a loop is all zero, unless the graph is signed and the loop is negative; then the column is all zero except for ±2 in the row of its incident vertex.
The definitions of incidence matrix apply to graphs with [[loop (graph theory)|loops]] and [[multiple edges]]. The column of an oriented incidence matrix that corresponds to a loop is all zero, unless the graph is signed and the loop is negative; then the column is all zero except for ±2 in the row of its incident vertex.
The definitions of incidence matrix apply to graphs with loops and multiple edges. The column of an oriented incidence matrix that corresponds to a loop is all zero, unless the graph is signed and the loop is negative; then the column is all zero except for ±2 in the row of its incident vertex.
The definitions of incidence matrix apply to graphs with loops and multiple edges. The column of an oriented incidence matrix that corresponds to a loop is all zero, unless the graph is signed and the loop is negative; then the column is all zero except for ±2 in the row of its incident vertex.
关于'''<font color="#ff8000">多重关联图 Multigraphs</font>'''的定义，与循环相对应的定向关联矩阵的列均为零，除非图有符号且循环为负；则该列除其入射顶点行中的±2外均为零。
===Hypergraphs===
===Hypergraphs===