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Hello!

You need use nicematrix package. It definitelly can do such matrices.

https://ctan.org/pkg/nicematrix

Unfortunatelly, I'm not LaTeX professional, so this is the best I can do, sorry.


\documentclass{article}

\usepackage{tikz}
\usepackage{nicematrix}

\begin{document}

$$
\begin ...

Welcome to the forum!

You could use alignat , for example:

\documentclass{article}
\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage[colorlinks=true]{hyperref}
\newcommand*\centermathcell[1]{\omit\hfil$\displaystyle#1$\hfil\ignorespaces}
\usepackage[showframe ...

Tried this: https://www.latex4technics.com/?note=2IYU


\documentclass{article}

\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}

\usepackage[colorlinks=true]{hyperref}

\newcommand*\centermathcell[1]{\omit\hfil$\displaystyle#1$\hfil\ignorespaces}

\usepackage[showframe ...

Just tried this solution: https://tex.stackexchange.com/a/102845


\documentclass{article}

\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{amsmath}

\usepackage[colorlinks=true]{hyperref}

\newcommand*\centermathcell[1]{\omit\hfil$\displaystyle#1$\hfil\ignorespaces ...

Hello all!

I typed the following equations:


\documentclass{article}

\usepackage[T2A]{fontenc}
\usepackage[utf8]{inputenc}

\usepackage{amsmath, eqnarray}

\usepackage[colorlinks=true]{hyperref}

\begin{document}

\vspace*{30\baselineskip}

\bgroup\arraycolsep 0.1em
\begin{equationarray}{*{9}{c ...