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It is for the Polish ł and Ł (l and L with stroke). Plain TeX contains \def\l{\char32l}. And LaTeX (OT1enc.def) defines \DeclareTextCommand{\l}{OT1} {\hmode@bgroup\@xxxii l\egroup} where \@xxxii stands for char32. \documentclass{article} \begin{document} \char32l \l \end{document}


From plain.tex: 663 \def\l{\char32l} 664 \def\L{\leavevmode\setbox0\hbox{L}\hbox to\wd0{\hss\char32L}} The glyph is used just for the Polish “suppressed l”. The support for Polish in Computer Modern is not complete, as the ogonek is missing, but, apparently, Knuth didn't need to typeset Polish names sporting the ogonek.


Yes, of course. \documentclass{article} \begingroup \catcode`+=\active \gdef+{\mathbin{\mathrm{blurb}}} \endgroup \AtBeginDocument{\mathcode`+="8000 } \begin{document} $x+y$ \end{document} Of course you can think to better definition for the “math active” +. ;-)


Use \tilde{\jmath}, but one may argue that the j character is not really nice then. \documentclass{article} \begin{document} $\tilde{\jmath}$ \end{document}


The basic idea is to use TikZ's graph-drawing mechanism. It accepts something like \graph{/--{/--{/,/},/}}; to draw a graph. So the next step is to translate [ is /--{ ] is } , is , . is / This is quite hard since TikZ does not like \graph\bgroup/--\bgroup/--\bgroup/,/\egroup,/\egroup\egroup; (Internally every pair of { and } will become an ...


The particular error is that the document loads two incompatible redefinitions of math mode, fouriernc and mathptmx but more generally the preamble loads multiple packages many of them three or four times, and most of them unneeded as the already extensive memoir class is used as base. It also loads newlfont, etex, fixltx2e which shouldn't be used with ...


A variant of Symbol1's answer that doesn't require auxiliary files. However, for technical reasons, instead of a period a * is used. \documentclass{article} \usepackage{tikz} \usetikzlibrary{graphs,graphdrawing} \usegdlibrary{layered} \newcommand{\setupbseriesactive}{% \begingroup\lccode`~=`[ \lowercase{\endgroup\def~{/--\iftrue{\else}\fi}}% ...


You could use forest to draw the trees. Since it requires a specification of a tree in brackets notation, it seems at least potentially suitable. Unlike the existing solutions, this one does not require LuaTeX. The examples below were compiled using pdfTeX, but any engine should work. I present 2 versions: The Original Edition requires you to write [] ...


The first symbol can be written with \sqsubseteq, the second symbol can be written with \equiv, the third symbol can be written with \neg. http://detexify.kirelabs.org/classify.html is a good link for finding the codes for symbols.

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