Truncation (no ontology)
From Higher Dimensions Database
Revision as of 00:42, 22 November 2011 by Hayate
Particular types of truncation include:
- Truncates the polytope to its "midpoint". In odd dimensions, this is represented as the middle Coxeter-Dynkin node ringed. In even dimensions, the middle two nodes are ringed.
- "Expands" the polytope. This is represented with the first and last nodes ringed. Etymology: "extra" is Latin for "outside" - you can imagine the ringed nodes as being on the "outside" (at the ends) of the diagram.