## Related pagesDuality principleAffine derivative Projective closure Affine planes Ternary fields |

- Each two distinct points are on a unique line.
- Each two distinct lines intersect in a unique point.
- There are four distinct points no three of which are on a common line.

Primary examples of projective planes are the projective planes over vector spaces. More general projective planes are coordinatized over ternary fields.

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