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Noun
1. submatrixMathematics
Wikipedia definition
2. SubmatrixIn mathematics, a submatrix is a matrix formed by selecting certain rows and columns from a bigger matrix. That is, as an array, it is cut down to those entries constrained by row and column. For example Then is a submatrix of A formed by rows 1,2 and columns 1,3,4. This submatrix can also be denoted by A(3;2) which means that it is formed by deleting row 3 and column 2. The above two methods are common, but there is no standard way to denote a submatrix.
Read “Submatrix” on English Wikipedia
Read “部分行列” on Japanese Wikipedia
Read “Submatrix” on DBpedia

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