[texhax] about \skip\footins --footnoterule

Barbara Beeton bnb at ams.org
Fri Sep 26 14:47:15 CEST 2008

    On  25 Sep, 2008, at 18:09, Donald Arseneau wrote:

    > "Axel E. Retif" <axel.retif at mac.com> writes:
    >>     \renewcommand{\footnoterule}{\vspace*{-3pt}}%
    > That is an error!  \footnoterule must consume zero vertical space.

    Thank you. I'll look into this. I took half the code from The LaTeX  
    Companion, 2nd ed., p. 112:

    > \footnoterule [...] The default definition is equivalent to the  
    > following:
    >   \renewcommand\footnoterule{\vspace*{-3pt}%
    >      \hrule width 2in height 0.4pt \vspace*{2.6pt}}

    So to get no rule I omitted the second half of the code.

you failed to notice that this is a three-part
     \hrule width 2in height 0.4pt

the first part backs up three points;
the second adds .4pt as a rule;
the third adds 2.6pt of space.
the total space occupied is 0pt (-3 + .4 + 2.6).
so an equivalent definition without a rule would
be either
or just

							-- bb

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