English: The Tits index of type E133 8,1, created using tikz.
Source
“Classification of algebraic semisimple groups”, in Algebraic Groups and Discontinuous Subgroups (Proc. Sympos. Pure Math., Boulder, Colo., 1965), Providence, R.I.: American Mathematical Society, 1966, pages 33–62
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Source code:
\documentclass{standalone}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{calc,decorations.pathreplacing,decorations.markings}
\usetikzlibrary{fit,math,positioning,arrows.meta,shapes.geometric}
\tikzset{
n/.style={fill=black,circle, %% node
inner sep=0pt,minimum size=4pt},
e/.style={fill=black,circle, %% ellipses
inner sep=0pt,minimum size=2pt},
w/.style={fill=white,draw=white,circle, %% white (omitted) nodes
inner sep=0pt,minimum size=4pt},
c/.style={ellipse,draw=black,inner sep=1pt}, %% circles
b/.style={decoration={brace,amplitude=10pt},decorate,thick}, %% brace
a/.style={postaction={decorate,decoration={
markings, mark=at position .5 with
{\arrow[black]{Straight Barb[length=\al]}}
}}} %% mid arrow
}
\def\v{0.5cm} %% vertical node space
\def\h{1cm} %% horizontal node space
\def\s{1.8pt} %% space for weighted edges
\def\al{5pt} %% arrow length
\def\l{2.5*\v} %% label separator
\begin{document}
\begin{tikzpicture}
\foreach \x in {1,...,7} {
\node[n] (\x) at (\x*\h,0) {};
}
\node[n] (8) [above=\h of 5] {};
\foreach \x [evaluate=\x as \y using int(\x-1)] in {2,...,7} {
\draw (\x.center) -- (\y.center);
}
\draw (5.center) -- (8.center);
\node[c,fit=(1)] at (1) {};
\end{tikzpicture}
\end{document}
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== Summary == {{Information | description = The Tits index of type E{{su|p=133|b=8,1}}, created using tikz. | source = {{Citation | ref=harv | last1=Tits | first1=Jacques | author-link = Jacques Tits | title=Algebraic Groups and Discontinuous Subgroups (Proc. Sympos. Pure Math., Boulder, Colo., 1965) | publisher=American Mathematical Society | location=Providence, R.I. |mr=0224710 | year=1966 | chapter=Classification of algebraic semisimple groups | pages=33–62}} | date ...