1. Apr 6, 2008 #1

   Physics_wiz

   

   Does anyone know a formula for the inverse of a sum of two upper triangular matrices?

    

   Physics_wiz, Apr 6, 2008
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3. Apr 7, 2008 #2

   HallsofIvy

   

   Staff Emeritus

   Science Advisor

   What makes you think there is such a formula?
   
   Have you looked at the inverse of
   [tex]\left(\begin{array}{cc}a & b \\ 0 & c\end{array}\right)+ \left(\begin{array}{cc}x & y \\ 0 & z\end{array}\right)[/tex]?

    

   HallsofIvy, Apr 7, 2008

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