Related pages

Isomorphisms of partial linear spaces
Isomorphisms of linear spaces
Isomorphisms of projective planes
Given two incidence structures and , an isomorphism from to is a pair of bijections


Two incidence structures are isomorphic if there exists an isomorphism from to . An isomorphism respects point rows and line pencils, i.e.

for all points p and all lines l.

Obviously, the set of all automorphisms of an incidence structure is a subgroup of the group

called the automorphism group of .

See also

Contributed by Hauke Klein
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