Template:Xyz

$\left({\begin{array}{ccc}A^{f,f}&A^{f,g}&0\\A^{g,f}&A^{g,g}&0\\0&0&0\\\end{array}}\right)+\left({\begin{array}{ccc}0&0&0\\0&A_{g,g}^{-1}(\lambda ^{-1}-1)&-\lambda ^{-1}A_{g,g}^{-1}M\\0&-M'A_{g,g}^{-1}\lambda ^{-1}&M'A_{g,g}^{-1}\lambda ^{-1}M\\\end{array}}\right)+\left({\begin{array}{ccc}0&0&0\\0&0&0\\0&0&D^{-1}\gamma ^{-1}\\\end{array}}\right)$