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  2. Intrinsic and extrinsic properties - Wikipedia

    en.wikipedia.org/wiki/Intrinsic_and_extrinsic...

    In materials science, an intrinsic property is independent of how much of a material is present and is independent of the form of the material, e.g., one large piece or a collection of small particles. Intrinsic properties are dependent mainly on the fundamental chemical composition and structure of the material. [1]

  3. Flattening - Wikipedia

    en.wikipedia.org/wiki/Flattening

    The usual notation for flattening is and its definition in terms of the semi-axes and of the resulting ellipse or ellipsoid is f = a − b a . {\displaystyle f={\frac {a-b}{a}}.} The compression factor is b / a {\displaystyle b/a} in each case; for the ellipse, this is also its aspect ratio .

  4. Spheroid - Wikipedia

    en.wikipedia.org/wiki/Spheroid

    A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.

  5. Elliptic geometry - Wikipedia

    en.wikipedia.org/wiki/Elliptic_geometry

    The hyperspherical model is the generalization of the spherical model to higher dimensions. The points of n-dimensional elliptic space are the pairs of unit vectors (x, −x) in R n+1, that is, pairs of antipodal points on the surface of the unit ball in (n + 1)-dimensional space (the n-dimensional hypersphere).

  6. Ellipse - Wikipedia

    en.wikipedia.org/wiki/Ellipse

    An ellipse (red) obtained as the intersection of a cone with an inclined plane. Ellipse: notations Ellipses: examples with increasing eccentricity. In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant.

  7. Elliptic operator - Wikipedia

    en.wikipedia.org/wiki/Elliptic_operator

    The definition of ellipticity in the previous part of the article is strong ellipticity. Here ( ⋅ , ⋅ ) {\displaystyle (\cdot ,\cdot )} is an inner product. Notice that the ξ {\displaystyle \xi } are covector fields or one-forms, but the v {\displaystyle v} are elements of the vector bundle upon which D {\displaystyle D} acts.

  8. Kepler's laws of planetary motion - Wikipedia

    en.wikipedia.org/wiki/Kepler's_laws_of_planetary...

    The orbits are ellipses, with foci F 1 and F 2 for Planet 1, and F 1 and F 3 for Planet 2. The Sun is at F 1. The shaded areas A 1 and A 2 are equal, and are swept out in equal times by Planet 1's orbit. The ratio of Planet 1's orbit time to Planet 2's is (/) /.

  9. Modularity theorem - Wikipedia

    en.wikipedia.org/wiki/Modularity_theorem

    The theorem states that any elliptic curve over can be obtained via a rational map with integer coefficients from the classical modular curve X 0 (N) for some integer N; this is a curve with integer coefficients with an explicit definition.

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