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04/03/2023
L_∞ norm minimization for nowhere-zero integer eigenvectors of the block graphs of Steiner triple systems and Johnson graphs
We study nowhere-zero integer eigenvectors of the block graphs of Steine...
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10/20/2022
On completely regular codes with minimum eigenvalue in geometric graphs
We prove that any completely regular code with minimum eigenvalue in any...
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12/13/2020
Completely regular codes in Johnson and Grassmann graphs with small covering radii
Let L be a Desarguesian 2-spread in the Grassmann graph J_q(n,2). We pro...
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09/17/2020
Coordinate transitivity of extended perfect codes and their SQS
We continue the study of the class of binary extended perfect propelinea...
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12/19/2019
On existence of perfect bitrades in Hamming graphs
A pair (T_0,T_1) of disjoint sets of vertices of a graph G is called a p...
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05/24/2019
A concatenation construction for propelinear perfect codes from regular subgroups of GA(r,2)
A code C is called propelinear if there is a subgroup of Aut(C) of order...
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10/10/2018
On components of a Kerdock code and the dual of the BCH code C_1,3
In the paper we investigate the structure of i-components of two classes...
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07/12/2018