Nils R. Barth, the copyright holder of this work, hereby publishes it under the following license:
Public domainPublic domainfalsefalse
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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\documentclass{amsart}\usepackage[all, ps, dvips]{xy}% Loading the XY-Pic package% Using postscript driver for smoother% curves\usepackage{color}% For invisible frame\DeclareMathOperator{\SL}{SL}\DeclareMathOperator{\PSL}{PSL}\begin{document}\thispagestyle{empty}% No page numbers\SelectTips{eu}{}% Euler arrowheads (tips)\setlength{\fboxsep}{0pt}% Frame box margin{\color{white}\framebox{{\color{black}$$% Frame for margin\xymatrix@R=6pt{ & B_3\ar@{->>}r\ar@{^(->}dd & \PSL_2(\mathbf{Z})\ar@{^(->}dd\\\mathbf{Z} \ar@{_(->}@/^/[ur\ar@{^(->}@/_/[dr\\ & \overline{\SL_2(\mathbf{R})} \ar@{->>}r & \PSL_2(\mathbf{R})}$$}}}% end math, end frame\end{document}
Licensing
Public domainPublic domainfalsefalse
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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{{Information |Description = {{en|
Commutative diagram showing the
braid group ''B''<sub>3</sub> as the universal central extension of the
modular group, sitting as lattices inside [[:en
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