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  2. NordicTrack - Wikipedia

    en.wikipedia.org/wiki/NordicTrack

    NordicTrack is an American company that manufactures treadmills, strength training equipment, ellipticals, exercise bikes, and accessories. It is best known for its Nordic ski machines, low-impact exercisers, ellipticals, and incline trainers. NordicTrack is owned and managed by iFIT Health & Fitness Inc. and is headquartered in Logan, Utah.

  3. Ellipsoidal coordinates - Wikipedia

    en.wikipedia.org/wiki/Ellipsoidal_coordinates

    An alternative parametrization exists that closely follows the angular parametrization of spherical coordinates: [1] = ⁡ ⁡, = ⁡ ⁡, = ⁡. Here, > parametrizes the concentric ellipsoids around the origin and [,] and [,] are the usual polar and azimuthal angles of spherical coordinates, respectively.

  4. Elliptic curve - Wikipedia

    en.wikipedia.org/wiki/Elliptic_curve

    When | w n − z n | = | w n + z n |, there is an additional condition that Im(⁠ z n / w n ⁠) > 0. [21] Over the complex numbers, every elliptic curve has nine inflection points. Every line through two of these points also passes through a third inflection point; the nine points and 12 lines formed in this way form a realization of the ...

  5. Elliptic surface - Wikipedia

    en.wikipedia.org/wiki/Elliptic_surface

    Example: Let L be the lattice Z+iZ of C, and let E be the elliptic curve C/L. Then the projection map from E×C to C is an elliptic fibration. We will show how to replace the fiber over 0 with a fiber of multiplicity 2. There is an automorphism of E×C of order 2 that maps (c,s) to (c+1/2, −s). We let X be the quotient of E×C by this group ...

  6. Elliptic cylindrical coordinates - Wikipedia

    en.wikipedia.org/wiki/Elliptic_cylindrical...

    The yellow sheet is the prism of a half-hyperbola corresponding to ν=-45°, whereas the red tube is an elliptical prism corresponding to μ=1. The blue sheet corresponds to z=1. The three surfaces intersect at the point P (shown as a black sphere) with Cartesian coordinates roughly (2.182, -1.661, 1.0).

  7. Elliptic coordinate system - Wikipedia

    en.wikipedia.org/wiki/Elliptic_coordinate_system

    Elliptic coordinate system. In geometry, the elliptic coordinate system is a two-dimensional orthogonal coordinate system in which the coordinate lines are confocal ellipses and hyperbolae.

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