# Inverse of Matrix Sum

## Main Question or Discussion Point

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

## Answers and Replies

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HallsofIvy
$$\left(\begin{array}{cc}a & b \\ 0 & c\end{array}\right)+ \left(\begin{array}{cc}x & y \\ 0 & z\end{array}\right)$$?