\frenchspacing (LaTeX2e unofficial reference manual (November 2018))

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#### 19.5.2 `\frenchspacing`

Synopsis, one of:

    \frenchspacing
    \nonfrenchspacing

The first declaration causes LaTeX to treat spacing between sentences in the same way as spacing between words in the middle of a sentence. The second causes spacing between sentences to stretch or shrink more (see \spacefactor); this is the default.

Some typographic traditions, including English, prefer to adjust the space between sentences (or spaces following a question mark, exclamation point, comma, or colon) more than the space between words that are in the middle of a sentence. Declaring `\frenchspacing` (the command is from Plain TeX) switches to the tradition that all spaces are treated equally.

Unofficial LaTeX2e reference manual