MinT - Best Known (68, 68+153, s)-Nets in Base 4

Best Known (68, 68+153, s)-Nets in Base 4

(68, 68+153, 66)-Net over F₄ — Constructive and digital

Digital (68, 221, 66)-net over F₄, using

t-expansion [i] based on digital (49, 221, 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]

(68, 68+153, 99)-Net over F₄ — Digital

Digital (68, 221, 99)-net over F₄, using

t-expansion [i] based on digital (61, 221, 99)-net over F₄, using
- net from sequence [i] based on digital (61, 98)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 61 and N(F) ≥ 99, using
    - Drinfeld modules of rank 1 [i]

(68, 68+153, 476)-Net in Base 4 — Upper bound on s

There is no (68, 221, 477)-net in base 4, because

1 times m-reduction [i] would yield (68, 220, 477)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 2 988826 086490 393859 718851 343917 119605 238568 889381 868049 049321 150152 821196 780676 756672 920861 268963 968591 763957 602055 748612 326396 251797 > 4²²⁰ [i]