We construct several classes of completely regular codes with different parameters, but identical intersection array. Given a prime power q and any two natural numbers a,b, we construct completely transitive codes over different fields with covering radius ρ=min{a,b}ρ=min{a,b} and identical intersection array, specifically, one code over F_q^r for each divisor r of a or b. As a corollary, for any prime power qq, we show that distance regular bilinear forms graphs can be obtained as coset graphs from several completely regular codes with different parameters.
English
Bilinear forms graph; Completely regular code; Completely transitive code; Coset graph; Distance-regular graph; Distance-transitive graph; Kronecker product construction; Lifting of a field; Uniformly packed code
Ministerio de Ciencia e Innovación TIN2016-77918-P
Ministerio de Ciencia e Innovación MTM2015-69138-REDT
Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-691
Discrete Mathematics ; Vol. 340 Núm. 7 (July 2017), p. 1649-1656
open access
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