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- W1590336317 abstract "We point out an interesting connection between Williamson matrices and relative difference sets in nonabelian groups. As a consequence, we are able to show that there are relative (4t, 2, 4t, 2t)-difference sets in the dicyclic groups Q 8t = 〈a, b|a 4t = b 4 = 1, a 2t = b 2, b -1ab = a-1〉 for all t of the form t = 2a · 10 b · 26 c · m with a, b, c ≥ 0, m ≡ 1 (mod 2), whenever 2m-1 or 4m-1 is a prime power or there is a Williamson matrix over ℤm. This gives further support to an important conjecture of Ito IT5 which asserts that there are relative (4t, 2, 4t, 2t)-difference sets in Q 8t for every positive integer t. We also give simpler alternative constructions for relative (4t, 2, 4t, 2t)-difference sets in Q 8t for all t such that 2t - 1 or 4t - 1 is a prime power. Relative difference sets in Q 8t with these parameters had previously been obtained by Ito IT1. Finally, we verify Ito's conjecture for all t ≤ 46." @default.
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- W1590336317 doi "https://doi.org/10.1023/a:1008398319853" @default.
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