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| | \end{bmatrix} </math> = | | \end{bmatrix} </math> = |
| | <math>\begin{bmatrix} | | <math>\begin{bmatrix} |
| − | a_{11}b_{11} a_{11}b_{12} a_{12}b_{11} a_{12}b_{12}\\ | + | a_{11}b_{11} & a_{11}b_{12} & a_{12}b_{11} & a_{12}b_{12}\\ |
| | + | a_{11}b_{21} & a_{11}b_{22} & a_{12}b_{21} & a_{12}b_{22}\\ |
| | + | a_{21}b_{11} & a_{21}b_{12} & a_{22}b_{11} & a_{22}b_{12}\\ |
| | + | a_{21}b_{21} & a_{21}b_{22} & a_{22}b_{21} & a_{22}b_{22} |
| | \end{bmatrix} </math> | | \end{bmatrix} </math> |