| 11. | All known projective planes have orders that are prime powers.
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| 12. | Every finite generalized polygon except the projective planes is a near polygon.
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| 13. | The quotient can be identified with the real projective plane.
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| 14. | These statements hold for infinite projective planes as well.
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| 15. | The existence of finite projective planes of other orders is an open question.
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| 16. | These two points are identified in the projective plane.
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| 17. | Every nonempty, compact, connected 2-manifold ( or projective planes.
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| 18. | The ambiguity happens when we project from the projective plane into R 2.
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| 19. | A hypersurface on a projective plane is commonly called a plane projective curve.
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| 20. | This torus may be embedded in the complex projective plane by means of the map
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