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- National Institute for AstrophysicsIT178 papers
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17 papers · 1 filter
Symmetric 2(36,15,6) designs with an automorphism of order two
Sanja Rukavina, Vladimir D. Tonchev
The parameters 2-(36,15,6) are the smallest parameters of symmetric designs for which a complete classification up to isomorphism is yet unknown. Bouyukliev, Fack and Winne classif…
New examples of self-dual near-extremal ternary codes of length 48 derived from 2-(47,23,11) designs
Sanja Rukavina, Vladimir D. Tonchev
In a recent paper [M. Araya, M. Harada, Some restrictions on the weight enumerators of near-extremal ternary self-dual codes and quaternary Hermitian self-dual codes, Des. Codes Cr…
On symmetric 2-(70,24,8) designs with an automorphism of order 6
Sanja Rukavina, Vladimir D. Tonchev
In this paper we analyze possible actions of an automorphism of order six on a - design, and give a complete classification for the action of the cyclic automorphis…
Self-dual Hadamard bent sequences
Minjia Shi, Yaya Li, Wei Cheng +3
A new notion of bent sequence related to Hadamard matrices was introduced recently, motivated by a security application ( Solé et al, 2021). We study the self dual class in length…
Distance-regular graphs obtained from the Mathieu groups
Dean Crnkovic, Nina Mostarac, Andrea Svob
In this paper we construct distance-regular graphs admitting a transitive action of the five sporadic simple groups discovered by E. Mathieu, the Mathieu groups , ,…
On automorphism groups of a biplane (121,16,2)
Dean Crnković, Doris Dumičić Danilović, Sanja Rukavina
The existence of a biplane with parameters is an open problem. Recently, it has been proved by Alavi, Daneshkhah and Praeger that the order of an automorphism group of…