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The weight distribution of the self-dual $[128,64]$ polarity design code

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  • The weight distribution of the binary self-dual $[128,64]$ code being the extended code $C^{*}$ of the code $C$ spanned by the incidence vectors of the blocks of the polarity design in $PG(6,2)$ [11] is computed. It is shown also that $R(3,7)$ and $C^{*}$ have no self-dual $[128,64,d]$ neighbor with $d \in \{ 20, 24 \}$.
    Mathematics Subject Classification: Primary: 94B30; Secondary: 05B25.


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