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  2. Real coordinate space - Wikipedia

    en.wikipedia.org/wiki/Real_coordinate_space

    Cartesian coordinates identify points of the Euclidean plane with pairs of real numbers. In mathematics, the real coordinate space or real coordinate n-space, of dimension n, denoted R n or , is the set of all ordered n-tuples of real numbers, that is the set of all sequences of n real numbers, also known as coordinate vectors.

  3. Real projective space - Wikipedia

    en.wikipedia.org/wiki/Real_projective_space

    is called the real projective line, which is topologically equivalent to a circle. Thinking of points of ⁠ ⁠ as unit-norm complex numbers up to sign, the diffeomorphism ⁠ ⁠ is given by .

  4. Three-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Three-dimensional_space

    A representation of a three-dimensional Cartesian coordinate system. In geometry, a three-dimensional space (3D space, 3-space or, rarely, tri-dimensional space) is a mathematical space in which three values (coordinates) are required to determine the position of a point.

  5. Real Spaces - Wikipedia

    en.wikipedia.org/wiki/Real_Spaces

    Real Spaces: World Art History and the Rise of Western Modernism is a non-fiction book by art historian David Summers, who aims to reconcile Western art history to artistic cultural production around the world from all time periods.

  6. Vacuum permeability - Wikipedia

    en.wikipedia.org/wiki/Vacuum_permeability

    The vacuum magnetic permeability (variously vacuum permeability, permeability of free space, permeability of vacuum, magnetic constant) is the magnetic permeability in a classical vacuum.

  7. Orbital ring - Wikipedia

    en.wikipedia.org/wiki/Orbital_ring

    The orbital ring is somewhat similar to the "classic" space elevator concept. In the traditional space elevator, a large station is placed in geostationary orbit (GEO) so that it remains in a single location above the equator of Earth.

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