11 citations · 27 across the 10 of their papers we have counts for
10 papers
Nonexistence of Strong External Difference Families in Abelian Groups of Order Being Product of At Most Three Primes
Ka Hin Leung, Shuxing Li, Theo Fanuela Prabowo
Let be a product of at most three not necessarily distinct primes. We prove that there exists no strong external difference family with more than two subsets in abelian group $…
New nonexistence results on -generalized bent functions
Ka Hin Leung, Qi Wang
In this paper, we present some new nonexistence results on -generalized bent functions, which improved recent results. More precisely, we derive new nonexistence results for…
A new family of Hadamard matrices of order
Ka Hin Leung, Koji Momihara, Qing Xiang
Let be a prime power of the form with an arbitrary integer. In this paper we construct a difference family with parameters …
Upper Bounds for Cyclotomic Numbers
Tai Do Duc, Ka Hin Leung, Bernhard Schmidt
Let be a power of a prime , let be a nontrivial divisor of and write . We study upper bounds for cyclotomic numbers of order over the finite…
New constructions of Hadamard matrices
Ka Hin Leung, Koji Momihara
In this paper, we obtain a number of new infinite families of Hadamard matrices. Our constructions are based on four new constructions of difference families with four or eight blo…
No lattice tiling of by Lee Sphere of radius 2
Ka Hin Leung, Yue Zhou
We prove the nonexistence of lattice tilings of by Lee spheres of radius for all dimensions . This implies that the Golomb-Welch conjecture is true when…