Variants of cyclic difference sets
H. J. Ryser
Proc. Amer. Math. Soc. 41 (1973), 45-50
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Abstract: This paper is an exploratory study of certain rare and intriguing configurations that are ``almost'' cyclic difference sets. The variants are of two types. We give precise definitions of the variants and then establish some nonexistence theorems. Only a few examples of the variants are known to us and their complete structure is far from understood.
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cyclic difference set,
finite projective plane,
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planar difference set,
symmetric block design
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