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NEC Group
English Wikipedia - The Free Encyclopedia
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NEC Group
The
NEC Group
is one of the world's largest venue management companies.
See more at Wikipedia.org...
Non-Euclidean crystallographic group
In
mathematics
, a
non-Euclidean crystallographic group
,
NEC group
or
N.E.C. group
is a
discrete group
of
isometries
of the
hyperbolic
plane. These
symmetry groups
correspond to the
wallpaper groups
in
euclidean geometry
. A NEC group which contains only
orientation-preserving
elements is called a
Fuchsian group
, and any non-Fuchsian NEC group has an index 2 Fuchsian subgroup of orientation-preserving elements.
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