Quadruple systems of the projective spec
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M. S. Keranen; D. L. Kreher; P. J.-S. Shiue
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Article
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2003
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John Wiley and Sons
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English
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## Abstract We determine the distribution of quadruple systems among the orbits of 4βelement subsets under the action of PSL(2,q) on the projective line when __q__ββ‘β1 (mod 4). Β© 2003 Wiley Periodicals, Inc. J Combin Designs 11: 339β351, 2003; Published online in Wiley InterScience (www.interscienc