2

Code below gives me no styling for theorem.

\documentclass[12pt,a4paper]{article}
\usepackage{russ}
\usepackage[cp1251]{inputenc}
\usepackage[ukrainian,russian]{babel}
\usepackage[left=3cm,right=3cm,top=3cm,bottom=3cm]{geometry}
\usepackage{mathtools}
\usepackage[OMLmathrm,OMLmathbf]{isomath}
\usepackage{amsmath}
\usepackage[amsmath]{ntheorem}
\usepackage[bitstream-charter]{mathdesign}


\newtheorem{lem}{Лема}

\begin{document}

\begin{lem}
За умов (5) для довільного $s \in (0,1)$ рівняння
\begin{equation}\label{6}
  sf(k)=\mu
\end{equation}
має єдиний розв'язок $k_{s}>0.\\$
\end{lem}

\end{document}

enter image description here

  • Welcome to TeX.SX! There are no Cyrillic fonts with the bitstream-charter option to mathdesign, so the default ones are substituted and boldface or italics are lost during the substitution process. – egreg May 7 '14 at 20:46
2

The bitstream-charter option to mathdesign doesn't provide Cyrillic fonts.

You get some warnings

LaTeX Font Warning: Font shape `T2A/mdbch/m/n' undefined
(Font)              using `T2A/cmr/m/n' instead on input line 3.

LaTeX Font Warning: Font shape `T2A/mdbch/m/n' undefined
(Font)              using `OT1/cmr/m/n' instead on input line 15.

LaTeX Font Warning: Font shape `T2A/mdbch/m/it' undefined
(Font)              using `T2A/mdbch/m/n' instead on input line 17.

LaTeX Font Warning: Font shape `T2A/mdbch/b/n' undefined
(Font)              using `T2A/mdbch/m/n' instead on input line 18.

which mean just what I said: T2A is the encoding for Cyrillic and the mdbch font family (Bitstream Charter) has no font for it.

If you remove the loading of mathdesign, you get

enter image description here

I believe that no font coming with mathdesign has Cyrillic fonts.

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