MinT - Information on Result #2169204

Information on Result #2169204

There is no linear OA(7²⁷, 55, F₇, 23) (dual of [55, 28, 24]-code), because 2 times truncation would yield linear OA(7²⁵, 53, F₇, 21) (dual of [53, 28, 22]-code), but

constructionÂ Y1 [i] would yield
1. linear OA(7²⁴, 29, F₇, 21) (dual of [29, 5, 22]-code), but
  - constructionÂ Y1 [i] would yield
    1. OA(7²³, 25, S₇, 21), but
      - the (dual) Plotkin bound shows that MÂ â‰¥ 383 162462 761132 828802 / 11 > 7²³ [i]
    2. OA(7⁵, 29, S₇, 4), but
      - the linear programming bound shows that MÂ â‰¥ 3 384381 / 197 > 7⁵ [i]
2. linear OA(7²⁸, 53, F₇, 24) (dual of [53, 25, 25]-code), but
  - discarding factors / shortening the dual code would yield linear OA(7²⁸, 40, F₇, 24) (dual of [40, 12, 25]-code), but
    - constructionÂ Y1 [i] would yield
      1. linear OA(7²⁷, 30, F₇, 24) (dual of [30, 3, 25]-code), but
        â€œHi4â€ bound on codes from Brouwerâ€™s database [i]
      2. linear OA(7¹², 40, F₇, 10) (dual of [40, 28, 11]-code), but
        discarding factors / shortening the dual code would yield linear OA(7¹², 36, F₇, 10) (dual of [36, 24, 11]-code), but
        constructionÂ Y1 [i] would yield
        linear OA(7¹¹, 15, F₇, 10) (dual of [15, 4, 11]-code), but
        â€œBPMâ€ bound on codes from Brouwerâ€™s database [i]
        linear OA(7²⁴, 36, F₇, 21) (dual of [36, 12, 22]-code), but
        discarding factors / shortening the dual code would yield linear OA(7²⁴, 31, F₇, 21) (dual of [31, 7, 22]-code), but
        residual code [i] would yield OA(7³, 9, S₇, 3), but
        bound for OAs with index unity [i]

Mode: Bound (linear).

Optimality

Show details for fixed k and m, n and k, k and s, k and t, n and m, m and s, m and t, n and s, n and t.

Compare with Markus Grassl’s online database of code parameters.

Other Results with Identical Parameters

None.

Depending Results

None.