oneeff

Description

A oneeff element stores whether or not the parent triangulation is 1-efficient.

For now, 1-efficiency is only tested for ideal triangulations in which every vertex link is a torus or Klein bottle. In this setting, an ideal triangulation T is 1-efficient if, amongst all closed embedded normal surfaces in T, there are no surfaces at all of positive Euler characteristic, and the only surfaces with zero Euler characteristic are vertex linking.

1-efficiency testing might be expanded to a broader class of triangulations in future versions of Regina; see the calculation engine documentation for details.

Attributes