## Related pagesDuality principleDualities and polarities |

The new incidence structure

is the so called dual incidence structure of . In words, the points of the dual incidence structure are the lines of the original structure, and the lines of the new structure are the points of our old incidence structure.

The dual incidence structure admits the same automorphisms as the original geometry.

Obviously, if A denotes an
incidence matrix associated to
then the transposed matrix A^{t} is the corresponding
incidence matrix of the dual incidence structure.

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