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Barg–Delsarte–Zhang–Zhang conjecture on two-distance codes in Hamming spaces
Let $mathcal{H}q^n$ be the $q$ -ary Hamming space, and let $A(mathcal{H}q^n,{2,4})$ denote the maximum size of a code whose occurring nonzero Hamming distances are $2$ and $4$ . **B…
Conjectureopencoding-theory hamming-spaces two-distance-codesarXiv posted 2 days ago

Barg–Delsarte–Zhang–Zhang conjecture on two-distance codes in Hamming spaces