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Inverse of Matrix Sum

  1. Apr 6, 2008 #1
    Does anyone know a formula for the inverse of a sum of two upper triangular matrices?
  2. jcsd
  3. Apr 7, 2008 #2


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    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]?
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