\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{hyperref}

\title{Space after period and kerning tests}
\date{August 4, 2013}
\author{Vincent Lefèvre}

\begin{document}
\maketitle
\sloppy
\thispagestyle{empty}

If a period following a capital letter ends a sentence, it must be followed
by ``\verb|\spacefactor=\sfcode`\.{}|'' to reset the \emph{spacefactor} to
default. ``\verb|\@|'' must not be used before the period as it destroys
kerning. The following tests are based on information at
\url{http://tex.stackexchange.com/questions/55105/when-should-i-use-intersentence-spacing}.

\bigskip

{\Large

v\@. foo.

v. foo.

v.\ foo.

v.\@ foo.

\textit{f}\@. foo.

\textit{f}. foo.

\textit{f}.\ foo.

\textit{f}.\@ foo.

OP. foo.

OP.\ foo.

OP.\spacefactor=\sfcode`\.{} foo.

OP\@. foo.

\textit{OF}. foo.

\textit{OF}.\spacefactor=\sfcode`\.{} foo.

\textit{OF}\@. foo.

}

\end{document}

% $Id: space-after-period.tex 62376 2013-08-04 17:11:52Z vinc17/xvii $