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I have no problem with the current formatting of the function, but for the sake of the reader less familiar with Mathematica functions, is there a way to define, say, li = LogIntegral so that any form of LogIntegral in my output is presented as li instead? This seems to be the way it's usually presented.

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  • $\begingroup$ LogIntegral[z] // TraditionalForm? -- Sometimes TraditionalForm is the default output form. In output cells, it's StandardForm. E.g., Plot[LogIntegral[z], {z, 0, 1}, PlotLabel -> LogIntegral[z]] $\endgroup$
    – Michael E2
    May 3, 2016 at 16:35
  • $\begingroup$ @MichaelE2 that definitely works, but let's say I want to express LogIntegral as li while still in StandardForm. Is that possible? $\endgroup$
    – user170231
    May 3, 2016 at 16:39

2 Answers 2

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I'll make this brief: it's a job for a MakeBoxes rule. In this case a particularly simple one:

MakeBoxes[li : LogIntegral, StandardForm] := InterpretationBox["li", li]

Now LogIntegral prints as li.

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According to the documentation, Format[] seems to be done for that :

Unprotect[LogIntegral]
Format[LogIntegral[z_]] := li[z]
Protect[LogIntegral]
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