LaTeX normally leaves a little extra space after punctuation, such as the
period which ends a sentence. However, it
uses a rather simple rule for determining whether a period ends a
sentence: it assumes that periods end sentences unless they
follow an upper case letter. To tell LaTeX to insert extra space after
punctuation which follows an upper case letter, precede the punctuation
It is I\@.
would not be considered to be a sentence by LaTeX except for the \@.
See also \<space> for the opposite case
See also Line and Page Breaking
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Revised: Sheldon Green, 10 May 1995.