% Some modifications to the isolatin1 package.
%
\RequirePackage[latin1]{inputenc}
%
\newcommand\smartfrac[2]{
  \mathchoice{\textstyle\frac{#1}{#2}}{\frac{#1}{#2}}{
    \frac{#1}{#2}}{\frac{#1}{#2}}}
\catcode`\«=13\let«=\langle
%\catcode`\¬=13\let¬=\neg
\catcode`\°=13\let°=\circ
%\catcode`\±=13\let±=\pm
\catcode`\·=13\let·=\cdot
%\catcode`\µ=13\letµ=\mu
\catcode`\»=13\let»=\rangle
\catcode`\¼=13\def¼{{\smartfrac 14}}
\catcode`\½=13\def½{{\smartfrac 12}}
\catcode`\¾=13\def¾{{\smartfrac 34}}
%\catcode`\×=13\let×=\times
%\catcode`\÷=13\let÷=\div
\catcode`\ð=13\letð=\partial