Name
orbl (surface) — Is a normal surface orientable?
Description
An orbl
(surface) element stores whether or not a normal surface is
orientable.
Parents
The following elements contain orbl
(in the
context of the orientability of a normal surface):
surface
.
Children
Element orbl
(in the context of the
orientability of a normal surface) has no children.
Attributes
value
Either 1, -1 or 0. Value 1 signifies that the parent surface is
orientable, value -1 signifies that the parent surface is non-orientable
and value 0 signifies that the orientability of the parent surface
is still unknown.