ovoid$56944$ - meaning and definition. What is ovoid$56944$
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What (who) is ovoid$56944$ - definition

SPHERE-LIKE SURFACE IN PROJECTIVE SPACE OF DIMENSION D ≥ 3
Ovoid (Projective geometry)
  • To the definition of an ovoid: t tangent, s secant line

Ovoid (projective geometry)         
In projective geometry an ovoid is a sphere like pointset (surface) in a projective space of dimension . Simple examples in a real projective space are hyperspheres (quadrics).
Odostomia laevigata         
SPECIES OF MOLLUSC
Ovoid odostome
Odostomia laevigata, common name the ovoid odostome, is a species of sea snail, a marine gastropod mollusc in the family Pyramidellidae, the pyrams and their allies.Rosenberg, G.
Ovoid (polar space)         
CONCEPT IN MATHEMATICS
In mathematics, an ovoid O of a (finite) polar space of rank r is a set of points, such that every subspace of rank r-1 intersects O in exactly one point..

Wikipedia

Ovoid (projective geometry)

In projective geometry an ovoid is a sphere like pointset (surface) in a projective space of dimension d ≥ 3. Simple examples in a real projective space are hyperspheres (quadrics). The essential geometric properties of an ovoid O {\displaystyle {\mathcal {O}}} are:

  1. Any line intersects O {\displaystyle {\mathcal {O}}} in at most 2 points,
  2. The tangents at a point cover a hyperplane (and nothing more), and
  3. O {\displaystyle {\mathcal {O}}} contains no lines.

Property 2) excludes degenerated cases (cones,...). Property 3) excludes ruled surfaces (hyperboloids of one sheet, ...).

An ovoid is the spatial analog of an oval in a projective plane.

An ovoid is a special type of a quadratic set.

Ovoids play an essential role in constructing examples of Möbius planes and higher dimensional Möbius geometries.