{latex3} is about the new material being developed by the LaTeX3 Project. This includes the expl3 programming language along with higher-level concepts such as xparse.

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A flexible derivative macro with LaTeX3

In an earlier post I asked a question about writing a flexible derivative macro, and someone suggested that a LaTeX3 version might be easier to understand, so I decided to try my hand at writing one. ...
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Experimenting with l3box and l3skip's dim variables

Note: The following MWE has no significance in use or further application of any kind rather than just for experimenting with the packages explicitly written on the question title. ...
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Difficulty saving formatting to a sequence to be called later in my code

I had an idea about how to answer this question and started putting some things together. I wanted to put something together that was fairly powerful and could handle simplification of linear ...
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LaTeX3: If next in input stream is command X or environment X, do Y else Z

Because I write my own document class (okay, I try to ...), this question bothers me for weeks as there are many situation, in which I need something like this. Is there a way to test, if the next ...
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Problem adding caption with siunitx

I am using latex/beamer(texlive) to compile a document and I am getting an error. Apparently it has something to do with siunitx package. Here is a minimum working example. ...
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Sorting a list of tokens (not necessarily numerals) in expl3/LaTeX3

I'd like to sort a list of words according to their lexicographical order using expl3 code. My words are in a seq variable that I access in a stack-like manner (this is not relevant, though). I've ...
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ubuntu installing l3kernel and l3packages

I apologize for this very basic question. I've downloaded the current versions of l3kernel.zip and l3packages.zip, but have no idea how to install them. As far as I can tell, there is no ...
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miktex 2.7 on win 7 problem: metafont modes not seen by initexmf, Yap

I am using MikTeX 2.7 + WinEdt 5.x on WinXP for many years without problems. But after I installed it on another machine running Win 7, MikTeX appears to work partially: it compiles all LaTeX ...