% from sfonts.def
\DeclareErrorFont{OT1}{cmr}{m}{n}{19.907} % was lcmss
\DeclareFontSubstitution{OT1}{cmr}{m}{n}  % was lcmss
\input OT1cmss.fd

% from slides.def
\renewcommand{\familydefault}{\rmdefault}
% override lasy re-declaration
\input Ulasy.fd

% from slides.cls
\def\rmdefault{cmr} % was: lcmss        % no roman
\def\sfdefault{cmss}
\def\ttdefault{cmtt}
\def\itdefault{it}  % was: sl
\def\sldefault{sl}
\def\bfdefault{bx}

\def\ifourteenpt{14.4} % {13.82}
\def\iseventeenpt{17.28} % {16.59}
\def\itwentypt{20.74} % {19.907}
\def\itwentyfourpt{24.88} % {23.89}
\def\itwentyninept{28.66} %?
\def\ithirtyfourpt{34.4} %?
\def\ifortyonept{41.28} %?

% removed leading "l" everywhere
\SetSymbolFont{operators}{normal}
                 {OT1}{cmss}{m}{n}

\SetSymbolFont{letters}{normal}
                 {OML}{cmm}{m}{it}
\SetSymbolFont{symbols}{normal}
                 {OMS}{cmsy}{m}{n}
\SetSymbolFont{largesymbols}{normal}
                 {OMX}{cmex}{m}{n}

\SetSymbolFont{operators}{invisible}
                 {OT1}{cmss}{m}{In}
\SetSymbolFont{letters}{invisible}
                 {OML}{cmm}{m}{Iit}
\SetSymbolFont{symbols}{invisible}
                 {OMS}{cmsy}{m}{In}
\SetSymbolFont{largesymbols}{invisible}
                  {OMX}{cmex}{m}{In}
