Extremal Type I additive self-dual codes over $GF(4)$ with near-minimal shadow
Sunghyu Han · Korean Journal of Mathematics · 2018
In this paper, we define near-minimal shadow and study the existence problem of extremal Type I additive self-dual codes over $GF(4)$ with near-minimal shadow. We prove that there is no such codes if the code length $n = 6m+1 (m \geq 0)$, $n = 6m+5 (m \geq 1)$.