In this article we show that projective planes with a small collineation group of perspectivities can be used to construct Hadamard designs. ## 2001 Academic Press Ko and Ray-Chaudhuri [7] and Arasu and Jungnickel [1] gave some correspondences from an affine difference set of order n with n#0 (mod
Designs from projective planes and PBD bases
β Scribed by Malcolm Greig
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 305 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1063-8539
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β¦ Synopsis
The essential theme of this article is the exploitation of known configurations in projective planes in order to construct pairwise balanced designs. Among the results shown are (q 2 + 1)/2 β B((q + 1)/2, 2) for all odd prime powers q; the resolution of 31 of the Mullin and Stinson's open cases in the spectrum of B(P7, 1), where P7 is odd prime powers β₯ 7; some constructions showing the inessential nature of values in E a + , where E a + are PBD generating sets containing values equal to 1 mod(a) for 5 β€ a β€ 7; some constructions with block sizes being prime powers
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