MinT - Best Known (227−172, 227, s)-Nets in Base 4

Best Known (227−172, 227, s)-Nets in Base 4

(227−172, 227, 66)-Net over F₄ — Constructive and digital

Digital (55, 227, 66)-net over F₄, using

t-expansion [i] based on digital (49, 227, 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]

(227−172, 227, 91)-Net over F₄ — Digital

Digital (55, 227, 91)-net over F₄, using

t-expansion [i] based on digital (50, 227, 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]

(227−172, 227, 229)-Net over F₄ — Upper bound on s (digital)

There is no digital (55, 227, 230)-net over F₄, because

4 times m-reduction [i] would yield digital (55, 223, 230)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4²²³, 230, F₄, 168) (dual of [230, 7, 169]-code), but
  - residual code [i] would yield linear OA(4⁵⁵, 61, F₄, 42) (dual of [61, 6, 43]-code), but
    - 2 times truncation [i] would yield linear OA(4⁵³, 59, F₄, 40) (dual of [59, 6, 41]-code), but
      - residual code [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]

(227−172, 227, 357)-Net in Base 4 — Upper bound on s

There is no (55, 227, 358)-net in base 4, because

the generalized Rao bound for nets shows that 4^mÂ â‰¥ 48747 319553 844967 054774 274350 661766 238441 521845 335435 825298 695009 060055 111447 369966 105089 653781 723291 432315 730290 592002 155392 736302 137120 > 4²²⁷ [i]