grunbaumBallComplex S
Attributed to F. Alberto Grünbaum, this method returns a triangulation of a 3-ball with 14 vertices and 29 facets that is not shellable.
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This abstract simplicial complex is Cohen-Macaulay but not shellable.
Our enumeration of the vertices follows the gruenbaum example in Masahiro Hachimori's simplicial complex library.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/SimplicialComplexes/Documentation.m2:1240:0.