GNU Info

(texinfo)minus

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`@minus'{} (-): Inserting a Minus Sign
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  Use the `@minus{}' command to generate a minus sign.  In a
fixed-width font, this is a single hyphen, but in a proportional font,
the symbol is the customary length for a minus sign--a little longer
than a hyphen, shorter than an em-dash:

     `-' is a minus sign generated with `@minus{}',
     
     `-' is a hyphen generated with the character `-',
     
     `---' is an em-dash for text.

In the fixed-width font used by Info, `@minus{}' is the same as a
hyphen.

  You should not use `@minus{}' inside `@code' or `@example' because
the width distinction is not made in the fixed-width font they use.

  When you use `@minus' to specify the mark beginning each entry in an
itemized list, you do not need to type the braces (*note `@itemize':
itemize..)