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The unoriented incidence matrix of a graph G is related to the adjacency matrix of its line graph L(G) by the following theorem:
 
The unoriented incidence matrix of a graph G is related to the adjacency matrix of its line graph L(G) by the following theorem:
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图''G''的无向关联矩阵与其'''<font color="#ff8000">线图 Line Graph</font>'''''L''(''G'')的邻接矩阵有以下定理关系:
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图 ''G'' 的无向关联矩阵与其'''<font color="#ff8000">线图 Line Graph</font>''' ''L''(''G'')的邻接矩阵有以下定理关系:
    
: <math>A(L(G)) = B(G)^\textsf{T}B(G) - 2I_m.</math>
 
: <math>A(L(G)) = B(G)^\textsf{T}B(G) - 2I_m.</math>
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where A(L(G)) is the adjacency matrix of the line graph of G, B(G) is the incidence matrix, and I<sub>m</sub> is the identity matrix of dimension m.
 
where A(L(G)) is the adjacency matrix of the line graph of G, B(G) is the incidence matrix, and I<sub>m</sub> is the identity matrix of dimension m.
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其中''A''''L''(''G''))是''G''的线图的'''<font color="#ff8000">邻接矩阵 Adjacency Matrix</font>''',''B''(''G'')是关联矩阵,I<sub>m</sub> 是维数为m的'''<font color="#ff8000">单位矩阵 Identity Matrix</font>'''。
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其中 ''A''(''L''(''G'')) 是 ''G'' 的线图的'''<font color="#ff8000">邻接矩阵 Adjacency Matrix</font>''',''B''(''G'')是关联矩阵,I<sub>m</sub> 是维数为m的'''<font color="#ff8000">单位矩阵 Identity Matrix</font>'''。
     
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