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A positive-definite matrix is an important concept in linear algebra.

A positive-semidefinite matrix is one of the important concepts in linear algebra.

In linear algebra, triangular matrices play a very important role.

A skew-symmetric matrix has the characteristic that its transpose matrix is the inverse of the original matrix.

The calculation of this transposed matrix is a bit complicated.

This square matrix has the same number of rows and columns.

A diagonal matrix is a matrix in which all elements outside the main diagonal are zero.

A lower triangular matrix is a matrix where all the elements below the main diagonal are zero.

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