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