Russian/Cyrillic alphabets under the simple commands in math modes - Latex

Question

Can we write the Russian/Cyrillic alphabets/symbols using the Latex under the math modes?

For example, for the Greek alphabet, like

$\alpha$, $\beta$,

etc -- it is very easy. This is the sort of answer I want.

I am hoping to do the same for all these symbols below?

Answer 1

For UTF-8 encoding:

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}     % for UTF8 codepage in Windows
\usepackage[russian]{babel}     % need for russian hyphenation and some typographic rules

\begin{document}
\[
    \textrm{текст на русском}
\]
\end{document}

For 1 byte codepage in Windows:

\documentclass[12pt,a4paper]{article}
\usepackage[cp1251]{inputenc}       % for 1-byte russian codepage in Windows
\usepackage[russian]{babel}         % need for russian hyphenation and some typographic rules

\begin{document}
\[
    \textrm{текст на русском}
\]
\end{document}

With obsolete package mathtext it is possible write in russian in math mode without any additional commands:

\documentclass[12pt,a4paper]{article}
\usepackage{mathtext}               % must be before codepage and localization
\usepackage[cp1251]{inputenc}       % for 1-byte russian codepage in Windows
\usepackage[russian]{babel}         % need for russian hyphenation and some typographic rules

\begin{document}
\[
    \alpha,\,\beta\quad текст\ на\ русском
\]
\end{document}

And russian letters by command in latin:

\documentclass[12pt,a4paper]{article}
\usepackage[OT1,T2A]{fontenc}
\begin{document}
\[
    \textrm{\cyrb\CYRB\cyrshch\cyryu\cyryo\cyrery\cyrie\cyry\cyrm\cyrya\cyrishrt\CYRISHRT}
\]
\end{document}

You can find full list of commands for russian (and other сyrillic) letters in this document: The Cyrillic font encodings: T2A, T2B, T2C,and X2.