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incidence matrix
In mathematics, an incidence matrix is a matrix that shows the relationship between two classes of objects. If the first class is ''X'' and the second is ''Y'', the matrix has one row for each element of ''X'' and one column for each element of ''Y''. The entry in row ''x'' and column ''y'' is 1 if ''x'' and ''y'' are related (called incident in this context) and 0 if they are not. There are variations; see below.
==Graph theory==
Incidence matrices are mostly used in graph theory.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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