Andrew Parsloe ajparsloe at gmail.com
Tue Feb 16 05:30:07 UTC 2021

On 16/02/2021 5:10 pm, Murat Yildizoglu wrote:
>> Le 16 févr. 2021 à 11:07, Richard Kimberly Heck <rikiheck at lyx.org 
>> <mailto:rikiheck at lyx.org>> a écrit :
>> On 2/15/21 10:55 PM, Murat Yildizoglu wrote:
>>> Dear Lyxers,
>>> I have recently observed that I see the message 
>>> (L3-Programming-Layer) followed by a date (2021-02-06) in the status 
>>> bar when I compile a document.
>>> Do you have any idea about its meaning and origin?
>> That is the LaTeX version you have telling you that it is the latest and
>> greatest.
>> Riki
> Ah, Thank you Richard!
> I have recently updated to MacTex 2020 and this change came with it 
> probably.
> Happy to use the greatest version! :-)
> Prof. Murat Yildizoglu

More specifically: L3 (usually lowercase l3) refers to the LaTeX3 
project which has created a suite of macros organized into a programming 
language expl3 that is systematic in a way that TeX and LaTeX2e are not 
(although in the end the functions/statements in expl3 resolve 
themselves into TeX commands). See the documentation in the l3kernel 
package, particularly interface3.pdf. Increasing numbers of packages are 
being created using expl3. I've managed to write a couple, one 
stretching to many thousands of lines of code, whereas I struggle to 
cobble  5 lines of (La)TeX together. I presume the message in LyX means 
it is using expl3.


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