The projective line over a field F is the set of one-dimensional subspaces of F2 and may be identified with F∪{∞}.
Ancestors (8)
- Projective general linear group action on the projective line
- General linear group over a finite field
- Finite group theory
- Group theory
- Algebra
- Area of mathematics
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- Abel-Jacobi map of a genus-one curve
- Complex projective plane
- Divisor class on the projective line
- Gonality of a smooth plane quartic
- Hyperplane-section divisor of a projective plane curve
- Infinite negative-twist sum with zero global sections
- Involution of a degree-two map from a genus one curve
- Nonparametrizability of an elliptic curve
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- Rational parametrization of an algebraic curve
- Real conic without real rational points
- Rulings of a smooth quadric surface
- Sharply three-transitive on a projective line
- SL2 action on a finite projective line
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The projective line is a fundamental concept in projective geometry, representing a way to extend the notion of lines to include "points at infinity".