You can insert comments into the LaTeX input (*.tex) file. Anything following
a percent sign (%) until the end of the line is ignored by the
LaTeX processor.
In fact, the % ends a line without generating a space;
an end-of-line in LaTeX input is normally equivalent to a space.
Thus, for example, it allows one to split a word
over lines without inserting a break. For example
this is an extr%
ordinarily long word
would produce "this is an extraordinarily long word" with no breaks.
However, a command cannot be split over lines this way.
See also Special Characters,
Input to LaTeX
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Revised: Sheldon Green, 1 Jun 1995.