96 citations · 292 across the 62 of their papers we have counts for
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Butson-type complex Hadamard matrices and association schemes on Galois rings of characteristic 4
Takuya Ikuta, Akihiro Munemasa
We consider nonsymmetric hermitian complex Hadamard matrices belonging to the Bose-Mesner algebra of commutative nonsymmetric association schemes. First, we give a characterization…
On a lower bound for the Laplacian eigenvalues of a graph
Gary R. W. Greaves, Akihiro Munemasa, Anni Peng
If and denote, respectively, the -th largest Laplacian eigenvalue and the -th largest vertex degree of a graph, then . This inequality was…
Some restrictions on weight enumerators of singly even self-dual codes II
Masaaki Harada, Akihiro Munemasa
In this note, we give some restrictions on the number of vectors of weight in the shadow of a singly even self-dual code. This eliminates some of the possible w…
A matrix approach to the Yang multiplication theorem
Akihiro Munemasa, Pritta Etriana Putri
In this paper, we use two-variable Laurent polynomials attached to matrices to encode properties of compositions of sequences. The Lagrange identity in the ring of Laurent polynomi…