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Re: greatest integer function (old style notation in LaTeX)

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Subject: Re: greatest integer function (old style notation in LaTeX)
From: joe.gra...@stjlabs.com (Joe Grasso)
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by: Joe Grasso - Wed, 19 May 2021 12:54 UTC

On Saturday, July 29, 2000 at 3:00:00 AM UTC-4, Neil Zanella wrote:
> Hello,
> The modern notation $\lfloor \rfloor$ is used to typeset
> the floor or greatest integer function. A while ago there
> was a different notation in use for this function consisting
> of two square brackets with an extra vertical line in them
> as follows:
> --- ---
> || x ||
> --- ---
> I have not found symbols to typeset this notation in AmS-LaTeX.
> Is there such a symbol for LaTeX, perhaps available through a
> usepackage or something? (P.S. while I find the modern notation
> more intuitive I would like to be use this old notation for something
> else.)
> Thanks,
> Neil

Just thought I would put my two cents worth in on this one. I use Codecogs quite a bit to make equations. To get the traditional symbols used for Greatest Integer I do this:

\lbrack \! \lbrack (then whatever you want in the middle) \rbrack \! \rbrack

If this does not work, I will give you triple your money back. However, it works for me in Codecogs.
( https://codecogs.com/latex/eqneditor.php )

Joe

Re: greatest integer function (old style notation in LaTeX)

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From: rdtenn...@tennent.ca (Bob Tennent)
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Subject: Re: greatest integer function (old style notation in LaTeX)
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by: Bob Tennent - Wed, 19 May 2021 20:02 UTC

On Wed, 19 May 2021 05:54:32 -0700 (PDT), Joe Grasso wrote:
> On Saturday, July 29, 2000 at 3:00:00 AM UTC-4, Neil Zanella wrote:
>> Hello,
>> The modern notation $\lfloor \rfloor$ is used to typeset
>> the floor or greatest integer function. A while ago there
>> was a different notation in use for this function consisting
>> of two square brackets with an extra vertical line in them
>> as follows:
>> --- ---
>> || x ||
>> --- ---
>> I have not found symbols to typeset this notation in AmS-LaTeX.
>> Is there such a symbol for LaTeX, perhaps available through a
>> usepackage or something? (P.S. while I find the modern notation
>> more intuitive I would like to be use this old notation for something
>> else.)
>> Thanks,
>> Neil

Check out the Comprehensive LaTeX Symbols List:

https://ctan.org/pkg/comprehensive

I think \lBrack and \rBrack are what you're looking for.

Bob T.

Subject	Author
Re: greatest integer function (old style notation in LaTeX)	Joe Grasso
Re: greatest integer function (old style notation in LaTeX)	Bob Tennent