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With {NiceArray} of nicematrix. \documentclass{article} \usepackage{nicematrix} \begin{document} $\begin{NiceArray}{cc|cccc|cccc} & 1...18 & 19 & 20 & 21 & 22 & 23 & 24 & 25 & 26 \\ A_1' & A_1 & \Block{4-4}<\Large\bfseries>{\text{I}} &&&& \Block{4-4}<\Large\bfseries>{\text{I}} \...


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The package nicematrix has tools to address that kind of problem. \documentclass{article} \usepackage{nicematrix} \begin{document} \[ \NiceMatrixOptions{code-for-first-row=\scriptstyle,code-for-last-row=\scriptstyle} A=\begin{pNiceMatrix}[first-row,last-col=3] 1 & 2 & \\ a & b & 3 \\ c & d & 4 \\ e & f &...


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You draw the arrow by using Tikz instructions in the \CodeAfer of the {NiceTabular}. \documentclass{article} \usepackage{graphicx} \usepackage{nicematrix,tikz} \definecolor{myorange}{RGB}{231,152,0} \begin{document} {\setlength{\arrayrulewidth}{2pt} \setlength{\tabcolsep}{3pt} \arrayrulecolor{myorange} \begin{NiceTabular}{c c l>{\raggedleft\...


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