[texhax] The Em Rule, a Question of Style

[Philip TAYLOR]

Uwe Lueck wrote:

 > "P. R. Stanley"<paulrichardstanley at gmail.com>  wrote at 19.05.2010 16:19:35:

 >> Could you provide more details on the function of \exhyphenpenalty, plese?
 >
 > Search texbook.tex.

Or, rather more helpfully :  \exhyphenpenalty is the
penalty that is applied if a line is broken at an
explicit (whence the leading "ex") hyphen.  What
The TeXbook actually says (p.~96) is "Each potential
breakpoint has an associated 'penalty' which represents
the 'aesthetic cost' of breaking at that place.  [If a
line break occurs at a discretionary break], the penalty
is the current value of \hyphenpenalty if the pre-break
text is non-empty, or the current value of \exhyphenpenalty
if the pre-break text is empty."

** Phil.