complex projective line
English
Noun
complex projective line (plural complex projective lines)
- (analytic geometry, projective geometry) A complex line (especially, the set of complex numbers regarded as such) endowed with a point at infinity (thus becoming a projective line); (more formally) the set of equivalence classes of ordered pairs (α, β) of complex numbers, not both zero, with respect to the equivalence relation "(α, β) ≡ (λα, λβ) for all nonzero complex λ".
- 1985, R. G. Burns (translator), B. A. Dubrovin, A. T. Fomenko, S. P. Novikov, Modern Geometry — Methods and Applications: Part II, Springer, page 18,
- By way of an example, we consider in detail the complex projective line . […] Thus via the function the complex projective line becomes identified with the "extended complex plane" (i.e. the ordinary complex plane with an additional "point at infinity").
- 2..2.1 Theorem The complex projective line is diffeomorphic to the 2-dimensional sphere .
- 2009, Jean-Pierre Marquis, From a Geometrical Point of View: A Study of the History and Philosophy of Category Theory, Springer, page 14,
- Finally, C is interested in the geometry of the complex projective line .
- 2013, Angel Cano, Juan Pablo Navarrete, José Seade, Complex Kleinian Groups, Springer (Birkhäuser), page 142,
- Hence, is an uncountable union of complex projective lines.
- 2018, Norman W. Johnson, Geometries and Transformations, Cambridge University Press, page 194,
- As what is commonly called the Riemann sphere (after Bernhard Riemann, 1826–1866), the parabolic sphere ̇provides a conformal model for the complex projective line .
- 1985, R. G. Burns (translator), B. A. Dubrovin, A. T. Fomenko, S. P. Novikov, Modern Geometry — Methods and Applications: Part II, Springer, page 18,
Usage notes
(complex numbers plus point at infinity):
- The formal definition above is a version of the definition of a projective space by homogeneous coordinates. (See also Projective space#Introduction on Wikipedia.Wikipedia )
- Notations include: .
Synonyms
- (complex numbers plus point at infinity): extended complex numbers, Riemann sphere
Translations
complex numbers plus point at infinity — See also translations at Riemann sphere
See also
- complex projective plane
- complex projective space
- projective coordinates (= homogeneous coordinates)
- projective line
- real projective line
Further reading
- Riemann sphere#As the complex projective line on Wikipedia.Wikipedia
- Complex projective plane on Wikipedia.Wikipedia
- Complex projective space on Wikipedia.Wikipedia
- Real projective line on Wikipedia.Wikipedia
- Projective line on Wikipedia.Wikipedia
- Complex line on Wikipedia.Wikipedia
- Projective space on Wikipedia.Wikipedia
- Homogeneous coordinates on Wikipedia.Wikipedia
- Projective straight line on Encyclopedia of Mathematics