Transitive and Co-Transitive Caps

Details Transitive and Co-Transitive Caps Transitive and Co-Transitive Caps

2000-07-28

arxiv.org/abs/math/0007177v1

Mathematics

Combinatorics

To appear in The Bulletin of the Belgian Mathematical Society - Simon Stevin

Scientific paper

A cap in PG(r,q) is a set of points, no three of which are collinear. A cap is said to be transitive if its automorphism group in PGammaL(r+1,q) acts transtively on the cap, and co-transitive if the automorphism group acts transtively on the cap's complement in PG(r,q). Transitive, co-transitive caps are characterized as being one of: an elliptic quadric in PG(3,q); a Suzuki-Tits ovoid in PG(3,q); a hyperoval in PG(2,4); a cap of size 11 in PG(4,3); the complement of a hyperplane in PG(r,2); or a union of Singer orbits in PG(r,q) whose automorphism group comes from a subgroup of GammaL(1,q^{r+1}).

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