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I'm trying to create an special block matrix with the following structure:

enter image description here

Would you please guide me on how to design it?

Thank you.

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\documentclass{article}
\usepackage{amsmath}
\usepackage{multirow}

\begin{document}
$\begin{pmatrix}
\frac{\|Ar_0\|}{\|r_0\|} & \multirow{2}{*}{$\widetilde G_{m-1}$} \\
0 
\end{pmatrix}$
\end{document}

Output of the above code

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  • Thank you so much for your time and considerations.
    – Math-Data
    Sep 11 '20 at 20:38

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