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edited Jun 18, 2017 at 8:39

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this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \\ \multicolumn{3}{c}{$\upbracefill$}&\ &\\ \multicolumn{3}{c}{\scriptstyle n}&\\ & & & & \\ & \textrm{\huge 0} & & & \textrm{\huge 0} & \\ \multicolumn{6}{c}{$\upbracefill$}\\ \multicolumn{6}{c}{\scriptstyle N}\\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}

this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \\ \multicolumn{3}{c}{$\upbracefill$}&\ \multicolumn{3}{c}{\scriptstyle n}&\\ & & & & \\ & \textrm{\huge 0} & & & \textrm{\huge 0} & \\ \multicolumn{6}{c}{$\upbracefill$}\\ \multicolumn{6}{c}{\scriptstyle N}\\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}

this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \\ \multicolumn{3}{c}{$\upbracefill$}&\\ \multicolumn{3}{c}{\scriptstyle n}&\\ & & & & \\ & \textrm{\huge 0} & & & \textrm{\huge 0} & \\ \multicolumn{6}{c}{$\upbracefill$}\\ \multicolumn{6}{c}{\scriptstyle N}\\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}

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edited Mar 18, 2017 at 21:51

David Carlisle

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this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \ \\ \multicolumn{3}{c}{$\upbracefill$}&\ \multicolumn{3}{c}{\scriptstyle n}&\ &\\  & & & &  \  \\  & \textrm{\huge 0} & & & \textrm{\huge 0} & \ \\ \multicolumn{6}{c}{$\upbracefill$}\ \\ \multicolumn{6}{c}{\scriptstyle N}\ \\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}

this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \ \multicolumn{3}{c}{$\upbracefill$}&\ \multicolumn{3}{c}{\scriptstyle n}&\  & & & &  \  & \textrm{\huge 0} & & & \textrm{\huge 0} & \ \multicolumn{6}{c}{$\upbracefill$}\ \multicolumn{6}{c}{\scriptstyle N}\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}

this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \\ \multicolumn{3}{c}{$\upbracefill$}&\ \multicolumn{3}{c}{\scriptstyle n}&\\  & & & & \\  & \textrm{\huge 0} & & & \textrm{\huge 0} & \\ \multicolumn{6}{c}{$\upbracefill$}\\ \multicolumn{6}{c}{\scriptstyle N}\\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}

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answered Dec 18, 2012 at 14:52

barbara beeton

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this is really the same as david's answer, but is prettied up a bit:

output of example code

\documentclass{article} \usepackage{mathtools} \begin{document} \[ D = \begin{pmatrix} \;D_1 & 0 & 0 & & & \\[-.5ex] 0 & \clap{$\ddots$} & & & \raisebox{-1ex}{\huge 0} & \strut\enspace \\[4pt] 0 & 0 & D_n & & & \ \multicolumn{3}{c}{$\upbracefill$}&\ \multicolumn{3}{c}{\scriptstyle n}&\ & & & & \ & \textrm{\huge 0} & & & \textrm{\huge 0} & \ \multicolumn{6}{c}{$\upbracefill$}\ \multicolumn{6}{c}{\scriptstyle N}\ \noalign{\vspace{-2\normalbaselineskip}} \end{pmatrix} \vspace{2\normalbaselineskip} \] \end{document}