# Skewes' number

## Primary tabs

Synonym:
Skewes's number, Skewes number
Type of Math Object:
Definition
Major Section:
Reference

## Mathematics Subject Classification

### Symbol for logarithmic integral

I know li shouldn't be in italics. I tried preceding it with a backslash like in the entry LogarithmicIntegral. I got TeX error messages. I guess I'm missing something in the preamble.

### Re: Symbol for logarithmic integral

> I know li shouldn't be in italics. I tried preceding it with
> a backslash like in the entry LogarithmicIntegral. I got TeX
> error messages. I guess I'm missing something in the
> preamble.

Yes, you are missing the line

\DeclareMathOperator{\li}{li}

in the preamble.

### Re: Symbol for logarithmic integral

> Yes, you are missing the line
>
> \DeclareMathOperator{\li}{li}
>
> in the preamble.

That's precisely it. Thank you very much.