| 21. | The Fano plane is the projective plane arising from the field of two elements.
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| 22. | It is the smallest projective plane, with only seven points and seven lines.
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| 23. | The restricted planes given in this manner more closely resemble the real projective plane.
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| 24. | The following sections are limited to projective planes defined over commutative in that case.
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| 25. | A polarity in a projective plane of square order has at most absolute points.
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| 26. | Another such surface is the real projective plane.
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| 27. | A projective plane of order is an configuration.
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| 28. | In a projective plane, let represent a point, and represent a line.
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| 29. | Typical pencils of curves in the projective plane, for example, are written as
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| 30. | Indeed, there exist abstract ovals which can not lie in any projective plane.
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