SEMINAR: Groups and Combinatorics Seminar 16:00 Fri 27/10/2017: Hongxue Liang
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Groups and Combinatorics Seminar 16:00 Fri 27/10/2017: Hongxue Liang |
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There will be `cake' in the Mathematics and Statistics tea room at 15:40. The seminar starts at 16:00, and after 17:05 we go to the UniClub or Student Tavern for a drink.
Note the unusual location.
Speaker: Hongxue Liang (University of Western Australia)
Title: Flag-transitive point-primitive non-symmetric 2-(v,k,2) designs
Time and place: 16:00 Friday 27/10/2017 in Woolnough Lecture Theatre 2 GGGL:107
Abstract: A 2-(v,k,λ) design is a finite incidence structure D=(P, B) consisting of v points and b blocks such that every block is incident with k points, every point is incident with r blocks, and any two distinct points are incident with exactly λ blocks. D is called symmetric if v=b (or equivalently r=k), and non-trivial if 1< k< v. A flag of D is an incident point-block pair (α, B) where α is a point and B is a block. An automorphism of D is a permutation of the points which also permutes the blocks. The set of all automorphisms of D with the composition of maps is a group, denoted by Aut(D). A subgroup G≤Aut( D) is called point-primitive if it acts primitively on P and flag-transitive if it acts transitively on the set of flags of D. In this talk, we will focus on the flag-transitive point-primitive automorphism groups of non-symmetric 2-(v,k,2) designs.
Past and future seminars may be found at http://www.maths.uwa.edu.au/~glasby/S17.html
Contact |
Stephen Glasby
<[email protected]>
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Start |
Fri, 27 Oct 2017 16:00
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End |
Fri, 27 Oct 2017 17:00
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Submitted by |
Stephen Glasby <[email protected]>
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Last Updated |
Tue, 24 Oct 2017 11:30
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