greatest integer function (old style notation in LaTeX)

[Neil Zanella]

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

[Alp Aker]

> 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.

You want the St. Mary's Road font (free and available on CTAN).

AA

[Anthony Goreham]

> two square brackets with an extra vertical line in them
> as follows:
>
> --- ---
> || x ||
> --- ---
>

> Is there such a symbol for LaTeX, perhaps available through a
> usepackage or something?

Use the stmaryrd package:

\usepackage{stmaryrd}
$\llbracket x \rrbracket$

These two commands can be used with \left and \right, and the St Mary's
Road fonts are avilable in Type1 format as well as MetaFont.

----------------------------------------------------------
Anthony Goreham anthony...@queens.ox.ac.uk
The Queen's College, Oxford OX1 4AW, UK.

[nancysue...@gmail.com]

You can type \text{[} for the left bracket, then type in the numerical expression and \text{]} for the right bracket.

[Remalyn Fajardo]

On Thursday, March 29, 2018 at 6:41:19 AM UTC+8, nancysue...@gmail.com wrote:
> You can type \text{[} for the left bracket, then type in the numerical expression and \text{]} for the right bracket.

Try typing $[\![ ]\!]$.

[Joe Grasso]

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

[Bob Tennent]

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.