MinT - Best Known (256−197, 256, s)-Nets in Base 4

Best Known (256−197, 256, s)-Nets in Base 4

(256−197, 256, 66)-Net over F₄ — Constructive and digital

Digital (59, 256, 66)-net over F₄, using

t-expansion [i] based on digital (49, 256, 66)-net over F₄, using
- net from sequence [i] based on digital (49, 65)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 49 and N(F) ≥ 66, using
    - T₆ from the second tower of function fields by GarcÃa and Stichtenoth over F₄ [i]

(256−197, 256, 91)-Net over F₄ — Digital

Digital (59, 256, 91)-net over F₄, using

t-expansion [i] based on digital (50, 256, 91)-net over F₄, using
- net from sequence [i] based on digital (50, 90)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 50 and N(F) ≥ 91, using
    - a curve from the manYPoints database [i]

(256−197, 256, 245)-Net over F₄ — Upper bound on s (digital)

There is no digital (59, 256, 246)-net over F₄, because

17 times m-reduction [i] would yield digital (59, 239, 246)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4²³⁹, 246, F₄, 180) (dual of [246, 7, 181]-code), but
  - residual code [i] would yield linear OA(4⁵⁹, 65, F₄, 45) (dual of [65, 6, 46]-code), but
    - 1 times truncation [i] would yield linear OA(4⁵⁸, 64, F₄, 44) (dual of [64, 6, 45]-code), but
      - residual code [i] would yield linear OA(4¹⁴, 19, F₄, 11) (dual of [19, 5, 12]-code), but
        1 times truncation [i] would yield linear OA(4¹³, 18, F₄, 10) (dual of [18, 5, 11]-code), but
        â€œLizâ€ bound on codes from Brouwerâ€™s database [i]

(256−197, 256, 250)-Net in Base 4 — Upper bound on s

There is no (59, 256, 251)-net in base 4, because

9 times m-reduction [i] would yield (59, 247, 251)-net in base 4, but
- extracting embedded orthogonal array [i] would yield OA(4²⁴⁷, 251, S₄, 188), but
  - the (dual) Plotkin bound shows that MÂ â‰¥ 3 273390 607896 141870 013189 696827 599152 216642 046043 064789 483291 368096 133796 404674 554883 270092 325904 157150 886684 127560 071009 217256 545885 393053 328527 589376 / 63 > 4²⁴⁷ [i]