\documentclass[10pt]{beamer}
\usepackage{beamerthemesplit}
%\usefonttheme{serif}
\usetheme{CambridgeUS}
\usecolortheme{rose}
%\parindent=7mm
\usepackage[english,russian]{babel}
\usepackage{amsmath}
%\usepackage{umshrt}
%\setbeamercolor{background canvas}{bg=violet} цвет листа
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usepackage{multicol,amsthm,syntonly}
\usepackage[space,noadjust]{cite}
\usepackage{mathrsfs} %$\mathscr{B}$
\usepackage{eufrak}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\e}{\mathcal{E}}
\usepackage{color}
\usepackage{ragged2e}
\justifying
\renewcommand{\raggedright}{\leftskip=0pt \rightskip=0pt plus 0cm}
\usepackage{geometry} %способ ручной установки полей
\geometry{top=0.0cm} %поле сверху
\geometry{bottom=0.0cm} %поле снизу
\geometry{left=0.6cm} %поле справа
\geometry{right=0.6cm} %поле слева
\setbeamertemplate{navigation symbols}{}
\institute[\tiny{Г.А. Архипов}]{}
\begin{document}
\frame{
\begin{center}
{\baselineskip=9mm {\bf {Проблема}}}
\vspace*{11 mm}
{\bf {Архипов}}\\
{\tt (\,nnnn@mail.ru\,)}\\[7mm]
{МГУ,\\
г.\,Москва}
\end{center}}
\section*{Проблема}
\subsection[много]{}
\renewcommand\baselinestretch{1.0}\normalsize
%\baselineskip=5mm
%\sloppy
\frame{ если $a<b$}
\end{document}
