11. As ring, according to the general construction of a projective line over a ring. 12. These examples of topological rings have the projective line as their one-point compactifications. 13. Thus, the base space of the bundle is taken to be the projective line . 14. Effectively this is an example of a rational map between the projective line and the circle. 15. This agrees with [ [ projective line | ] ] being a curve of genus with points. 16. Similarly, the projective line over " k " is a one-dimensional space. 17. Similarly, the projective line over a ring is a one-dimensional space over the ring. 18. Hence we obtain an action of A _ 5 on the six points of a projective line . 19. The points of the real projective line are usually defined as equivalence classes of an equivalence relation. 20. As the parameter is defined in a projective line , the polynomials in the parameter should be homogenized.
