/usr/share/polymake/bundled/singular/polymake.ext is in polymake-common 3.2r2-3.
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Singular is a computer algebra system for polynomial computations, with special emphasis on commutative and non-commutative algebra, algebraic geometry, and singularity theory. It is free and open-source under the GNU General Public Licence.
http://www.singular.uni-kl.de/
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