Papers - Koichi BETSUMIYA
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Automorphism groups of cyclic orbifold vertex operator algebras associated with the Leech lattice and some non-prime isometries
Koichi Betsumiya, Ching Hung Lam, Hiroki Shimakura
Israel Journal of Mathematics 2023.10
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Automorphism groups and uniqueness of holomorphic vertex operator algebras of central charge $24$
Koichi Betsumiya, Ching Hung Lam, Hiroki Shimakura
Communications in Mathematical Physics 399 ( 3 ) 1773 - 1810 2022.12
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tame 自己同型群について
別宮 耕一
第31回有限群論草津セミナー報告集 31 1 - 3 2020.3
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拡張ハミング符号と正六百胞体との対応について
別宮 耕一
第30回有限群論草津セミナー報告集 30 37 - 42 2019.3
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Triply even code の極大性判定
別宮 耕一
第29回有限群論草津セミナー報告集 - 14 - 17 2018.3
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立方重偶符号の自己同型群に現れる単純群
別宮耕一
第２７回有限群論草津セミナー報告集 29 - 32 2016.3
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組合せ構造における純粋ナッシュ均衡性
別宮耕一
第２６回有限群論草津セミナー報告集 6 - 8 2015.7
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On triply even codes
BETSUMIYA Koichi
RIMS Kokyuroku 1844 139 - 145 2013.7
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Upper bounds on cyclotomic numbers
Koichi Betsumiya, Mitsugu Hirasaka, Takao Komatsu, Akihiro Munemasa
Linear Algebra and Its Applications 438 ( 1 ) 111 - 120 2013.1
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Classification of doubly even self-dual codes of length 40
別宮 耕一
第29回代数的組合せ論シンポジウム報告集 10 - 16 2013
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A complete classification of doubly even self-dual codes of length 40
Betsumiya Koichi, Harada Masaaki, Munemasa Akihiro
ELECTRONIC JOURNAL OF COMBINATORICS 19 ( 3 ) 2012.8
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On triply even binary codes
Koichi Betsumiya, Akihiro Munemasa
JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES 86 ( 1 ) 1 - 16 2012.8
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Hadamard matrices of order 32 and extremal ternary self-dual codes
Koichi Betsumiya, Masaaki Harada, Hiroshi Kimura
Designs, Codes and Cryptography. An International Journal 58 ( 2 ) 203 - 214 2011.2
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Invariant ring of Clifford-Weil group, and Jacobi forms over totally real field.
BETSUMIYA Koichi, Choie, YoungJu
Séminaires et Congrès 21 1 - 16 2010
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Mass Formula for Even Codes over Z4 （共著）
Koichi Betsumiya, Rowena Alma L. Betty and Akihiro Munemasa
Springer-Verlag Lecture Notes in Computer Science 5921 15 - 17 2009.12
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Mass formula for even codes over Z_8
別宮 耕一, 宗政 昭弘
Cryptography and Coding, Springer LNCS 5921 65 - 77 2009
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Minimum Lee weights of type II codes over F2r
Koichi BETSUMIYA
Discrete Mathematics 308 ( 14 ) 3018 - 3022 2008.7
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Type II codes over Galois rings
別宮耕一
第２４回代数的組合せ論シンポジウム報告集 51 - 54 2007.11
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アダマール行列による超立方体の分割
別宮耕一
第１８回有限群論草津セミナー報告集 69 - 70 2006.12
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Special Self-Dual Codes over $\mathbb{F}_4$(Theory and Applications of Combinatorial Designs with Related Field)
Betsumiya Koichi
1465 119 - 125 2006.1