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For an ovoid and a hyperplane , which contains at least two points of , the subset is an ovoid (or an oval, if d = 3) within the hyperplane . For finite projective spaces of dimension d ≥ 3 (i.e., the point set is finite, the space is pappian [ 1 ] ), the following result is true:
An ovoid is the surface in 3-dimensional space generated by rotating an oval curve about one of its axes of symmetry. The adjectives ovoidal and ovate mean having the characteristic of being an ovoid, and are often used as synonyms for "egg-shaped".
An ellipsoid is a surface that can be obtained from a sphere by deforming it by means of directional scalings, or more generally, of an affine transformation. An ellipsoid is a quadric surface; that is, a surface that may be defined as the zero set of a polynomial of degree two in three variables. Among quadric surfaces, an ellipsoid is ...
Poxviridae and Ovaliviridae: ovoid to ellipsoid; Gammaretrovirus and other Retroviridae, such as HIV, roughly round to complexly multiform (pleomorphic). From observations using microscopy, there are indications of many more distinct shapes.
For that reason, in cartography and geodesy the Earth is often approximated by an oblate spheroid, known as the reference ellipsoid, instead of a sphere. The current World Geodetic System model uses a spheroid whose radius is 6,378.137 km (3,963.191 mi) at the Equator and 6,356.752 km (3,949.903 mi) at the poles .
From the bundle theorem follows the existence of a) a skewfield (division ring) and b) an ovoid. If the more strict theorem of Miquel holds, the skewfield is even commutative (field) and the ovoid is a quadric. There are Möbius planes, which are not ovoidal. For ovoidal Laguerre planes there exists a bundle theorem with an analogous meaning.
The steering wheel bears an ovoid shape with a brass spoke at the bottom. Jaguar. Instead of drive modes, Jaguar created a unique way to change the experience inside the Type 00, which it calls ...
A condyloid joint (also called condylar, ellipsoidal, or bicondylar [1]) is an ovoid articular surface, or condyle that is received into an elliptical cavity. This permits movement in two planes, allowing flexion , extension , adduction , abduction , and circumduction .