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 by \@.
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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