latex中连字符、波折号和负号

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作者：Clerk Ma
链接：https://www.zhihu.com/question/20332423/answer/15367988
来源：知乎
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> Hyphens are used for compound words like ‘daughter-in-law’ and ‘X-rated’. En-dashes are used for number ranges like ‘pages 13–34’, and also in contexts like　‘exercise 1.2.6–52’. Em-dashes are used for punctuation in sentences—they are　what we often call simply dashes. And minus signs are used in formulas. A　conscientious user of TeX will be careful to distinguish these four usages, and here is how to do it:
　　　for a hyphen, type a hyphen (-);
　　　for an en-dash, type two hyphens (--);
　　　for an em-dash, type three hyphens (---);
　　　for a minus sign, type a hyphen in mathematics mode ($-$).

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