Also see Operator Definitions for newer supplementary material. The modern method treats definitions as more than a matter of appearance.

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The definition facility allows one to develop new notations in the form of templates which can be invoked when entering text. This feature provides a flexible way to introduce new notation. For instance, we might have defined a function, abs(x), which computes the absolute value of a number, but we might like to display it in the text as |x|. This can be accomplished by defining a template. The format is |<x:number>| == abs(<x>), where the left--hand side of == is the template and the right--hand side is the value (the angle brackets are used to designate the parameter).

Richard Eaton
Thu Sep 14 08:45:18 EDT 1995