pentachora

Description

This element was used in the past to store all pentachora in a 4-dimensional triangulation. Since Regina 7.0, these pentachora are now stored directly within the tri element (which replaces the old packet element for triangulation packets), and each pentachoron is encoded in a simplex element (as opposed to the pent elements described here).

A pentachora element stores the entire set of pentachora that form a 4-dimensional triangulation.

The total number of pentachora must be specified by the npent attribute. The individual pentachora are numbered 0, 1, 2, etc., and their facet gluings are described by the corresponding child pent elements. There must be precisely npent child pent elements in total.

Attributes

Example

The following XML snippet represents a triangulation of the product B³×S¹, formed from two pentachora.

<pentachora npent="2">
  <pent> 1 13380 -1 -1 -1 -1 -1 -1 1 2257 </pent>
  <pent> 0 13380 -1 -1 -1 -1 -1 -1 0 2257 </pent>
</pentachora>