packet (normal hypersurface list)

Description

In Regina 6.0.1 and earlier, the packet element was used to store every packet in the entire packet tree that makes up a Regina data file. This page describes how the packet element was structured when storing a normal hypersurface list. Since Regina 7.0, each packet type has its own XML element; in particular, normal hypersurface lists are now stored using the hypersurfaces element.

A normal hypersurface list packet stores a list of normal hypersurfaces in a particular 4-manifold triangulation. This list will often contain the vertex hypersurfaces whose convex span is the set of all normal hypersurfaces in the triangulation that satisfy certain constraints, though other lists (such as fundamental hypersurfaces, or other customised lists) can be stored also.

The parent element of this normal hypersurface list must be the triangulation in which the normal hypersurfaces lie. The individual normal hypersurfaces in this list are contained in the child hypersurface elements.

The parameters of the normal hypersurface enumeration that created this list are stored in the child params element.

The roles played by the child tag and packet elements are described in the general packet element documentation.