params

Specifies the algorithm that was used to enumerate these normal surfaces/hypersurfaces.

This must be an integer, formed as a bitwise OR combination of constants from Regina's calculation engine. For normal surfaces in a 3-manifold triangulation, these constants are taken from the NormalAlg enumeration; for normal hypersurfaces in a 4-manifold triangulation, they are taken from the HyperAlg enumeration.

An example of such an integer might be 17, which combines the constants NormalAlg::VertexViaReduced (1) and NormalAlg::VertexTree (16).

Deprecated. This should be T if only embedded normal surfaces were enumerated to form this list, or F if all (embedded, immersed and singular) normal surfaces were enumerated.

You should write this tag if you want your file to be read by Regina 4.93 or earlier. Later versions of Regina can also read it; however, they prefer the new type and algorithm tags, which contain richer information. If both type and algorithm are present then this embedded tag will be ignored.

The flavour of coordinate system used in the normal surface/hypersurface enumeration, expressed as a human-readable string. Example flavours are Quad normal and Standard almost normal (tri-quad-oct).

The flavour of coordinate system used in the normal surface/hypersurface enumeration, expressed as an internal identification code. This must be a non-negative integer that matches one of the coordinate system constants in Regina's calculation engine. For normal surfaces in a 3-manifold triangulation, this constant is taken from the NormalCoords enumeration; for normal hypersurfaces in a 4-manifold triangulation, it is taken from the HyperCoords enumeration.

An example of such an integer might be 102, which is the 3-dimensional constant NormalCoords::QuadOct that represents standard coordinates for octagonal almost normal surfaces.

Specifies exactly which normal surfaces/hypersurfaces this list contains. In particular, this flag indicates whether the list contains all vertex surfaces, all fundamental surfaces, or some other customised list. It also indicates whether the list is restricted to properly embedded surfaces (thereby replacing the obsolete embedded tag described above).

This must be an integer, formed as a bitwise OR combination of constants from Regina's calculation engine. For normal surfaces in a 3-manifold triangulation, these constants are taken from the NormalList enumeration; for normal hypersurfaces in a 4-manifold triangulation, they are taken from the HyperList enumeration.

An example of such an integer might be 5, which combines the constants NormalList::EmbeddedOnly (1) and NormalList::Vertex (4).