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Details van artikel 17 van 39 gevonden artikelen
| Titel: |
Minimal Blocking Sets in PG(n, 2) and Covering Groups by Subgroups |
| Auteur: |
Abdollahi, A. Ataei, M. J. Hassanabadi, A. Mohammadi |
| Verschenen in: |
Communications in algebra |
| Paginering: | Jaargang 36 (2008) nr. 2 pagina's 365-380 |
| Jaar: |
2008-02 |
| Inhoud: |
In this article we prove that a set of points B of PG(n, 2) is a minimal blocking set if and only if 〈B〉 = PG(d, 2) with d odd and B is a set of d + 2 points of PG(d, 2) no d + 1 of them in the same hyperplane. As a corollary to the latter result we show that if G is a finite 2-group and n is a positive integer, then G admits a n+1-cover if and only if n is even and G≅ (C2)n, where by a m-cover for a group H we mean a set C of size m of maximal subgroups of H whose set-theoretic union is the whole H and no proper subset of C has the latter property and the intersection of the maximal subgroups is core-free. Also for all n < 10 we find all pairs (m,p) (m > 0 an integer and p a prime number) for which there is a blocking set B of size n in PG(m,p) such that 〈B〉 = PG(m,p). |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 17 van 39 gevonden artikelen
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