11.8.9 @minus (−): Inserting a Minus Sign

Use the @minus{} command to generate a minus sign. Where the character encoding and font used in the output allow it, 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.

If you actually want to typeset some math that does a subtraction, it is better to use @math, as in @math{a-b} (see @math and @displaymath: Formatting Mathematics).