| 11. | In particular such a product of real projective spaces is not null-cobordant.
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| 12. | This definition is a special instance of the general definition of a projective space.
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| 13. | The projective space known as the Fano plane.
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| 14. | Its general projection to three-dimensional projective space is called a Steiner surface.
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| 15. | The Chow coordinates define a point in the projective space corresponding to all forms.
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| 16. | However, the projective space itself is homogeneous.
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| 17. | This can be used to compute the cohomology of line bundles on projective space.
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| 18. | These real projective spaces can be constructed in a slightly more rigorous way as follows.
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| 19. | For example a complex projective space has cup-length equal to its complex dimension.
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| 20. | A projective linear subspace of this projective space is called a linear system of divisors.
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