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What (who) is ovoid cell - definition
SPHERE-LIKE SURFACE IN PROJECTIVE SPACE OF DIMENSION D ≥ 3
Ovoid (Projective geometry)
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).
Cell (music)
SMALLEST INDIVISIBLE UNIT OF MUSIC OF RHYTHMIC AND MELODIC DESIGN
Musical cell; Intervallic cell; Rhythmic cell; Melodic cell
The 1957 Encyclopédie Laroussequoted in Nattiez, Jean-Jacques (1990). Music and Discourse: Toward a Semiology of Music (Musicologie générale et sémiologue, 1987).
Cell–cell interaction
![basolateral membrane]] is depicted as "sheets"; the space between these sheets being the extracellular environment and the location of adhesion protein interaction.](https://commons.wikimedia.org/wiki/Special:FilePath/Cell junctions.png?width=200 "basolateral membrane]] is depicted as \"sheets\"; the space between these sheets being the extracellular environment and the location of adhesion protein interaction.")
INTERACTION BETWEEN CELLS
Cell-cell interaction; Cell–cell interactions; Cell-cell interactions
Cell–cell interaction refers to the direct interactions between cell surfaces that play a crucial role in the development and function of multicellular organisms.
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 are:
- Any line intersects in at most 2 points,
- The tangents at a point cover a hyperplane (and nothing more), and
- 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.
