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\end{bmatrix}
.</math>
We can get an inverse formula by combining the previous results in.<ref>[http://ccrma.stanford.edu/~jos/lattice/Block_matrix_decompositions.html Block matrix decompositions|archiveurl=http://web.archive.org/web/20080915181439/http://ccrma.stanford.edu/~jos/lattice/Block_matrix_decompositions.html|archivedate=2008-09-15}]</ref>
:<math>\begin{bmatrix}
A & B \\
|