\begin{equation}Y{(1)}=\left[\begin{array}{ccc} \begin{equation}Y{(2)}=\left[\begin{array}{ccc} \begin{equation}Y{(3)}=\left[\begin{array}{ccc} \begin{equation}X=\left[\begin{array}{cccc}
y{11} & y{12} & y{13} \
y{21} & y{22} & y{23} \
\vdots & \vdots & \vdots \
y{a1} & y{a2} & y{a3}
\end{array}\right]\end{equation}
y{11} & y{12} & y{13} \
y{21} & y{22} & y{23} \
\vdots & \vdots & \vdots \
y{b1} & y{b2} & y{b3}
\end{array}\right]\end{equation}
y{11} & y{12} & y{13} \
y{21} & y{22} & y{23} \
\vdots & \vdots & \vdots \
y{c1} & y{c2} & y{c3}
\end{array}\right]\end{equation}
n=a+b+c
x{11} & x{12} & x{13} & x{14} \
x{21} & x{22} & x{23} & x{24} \
\vdots & \vdots & \vdots & \vdots \
x{n 1} & x{n 2} & x{n 3} & x{n 4}
\end{array}\right]\end{equation}
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```tex
\documentclass{article}
\usepackage[a4paper]{geometry}
\usepackage{mathtools}
\begin{document}
\begin{equation}
Y_{(1)} =
\begin{bmatrix}
y_{11} & y_{12} & y_{13} \\
y_{21} & y_{22} & y_{23} \\
\vdots & \vdots & \vdots \\
y_{a1} & y_{a2} & y_{a3}
\end{bmatrix}
\quad
Y_{(2)} =
\begin{bmatrix}
y_{11} & y_{12} & y_{13} \\
y_{21} & y_{22} & y_{23} \\
\vdots & \vdots & \vdots \\
y_{b1} & y_{b2} & y_{b3}
\end{bmatrix}
\quad
Y_{(3)} =
\begin{bmatrix}
y_{11} & y_{12} & y_{13} \\
y_{21} & y_{22} & y_{23} \\
\vdots & \vdots & \vdots \\
y_{c1} & y_{c2} & y_{c3}
\end{bmatrix}
\end{equation}
\[
n=a+b+cn=a+b+c
\]
\begin{equation}
X =
\begin{bmatrix}
x_{11} & x_{12} & x_{13} & x_{14} \\
x_{21} & x_{22} & x_{23} & x_{24} \\
\vdots & \vdots & \vdots & \vdots \\
x_{n1} & x_{n2} & x_{n3} & x_{n4}
\end{bmatrix}
\end{equation}
\end{document}
```
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