LaTeX provides for three sizes of dashes which are indicated by
typing one, two, or three consecutive dashes in the text.
Note that this applies to paragraph mode. In math mode each -
is interpreted as a minus sign.
- a hyphenation dash, as in X-ray, is a single dash
- a dash between limits, as in 1--2, is a double dash
- a parenthetical punctuation --- such as this --- is a triple dash
See also Spaces and boxes,
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Sheldon Green, email@example.com, 11 May 1995.