The nonexistence of (18,3,18,6) relative difference sets
It is known that relative difference sets with parameters (18,3,18,6) in a group of order 54 with normal subgroup N of order 3 do not exist in any abelian group of order 54. In this paper, using the recent classification of all generalized Hadamard matrices of order 18 over a group of order 3 , we show that such relative difference sets do not exist in any non-abelian group of order 54 as well. Our results are validated computationally using the computer algebra system Magma.
Sequences and Their Applications - SETA 2014
Clark, D. C.,
The nonexistence of (18,3,18,6) relative difference sets.
Sequences and Their Applications - SETA 2014, 149-153.
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