MinT - Best Known (186−121, 186, s)-Nets in Base 4

Best Known (186−121, 186, s)-Nets in Base 4

(186−121, 186, 66)-Net over F₄ — Constructive and digital

Digital (65, 186, 66)-net over F₄, using

t-expansion [i] based on digital (49, 186, 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]

(186−121, 186, 99)-Net over F₄ — Digital

Digital (65, 186, 99)-net over F₄, using

t-expansion [i] based on digital (61, 186, 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]

(186−121, 186, 507)-Net in Base 4 — Upper bound on s

There is no (65, 186, 508)-net in base 4, because

1 times m-reduction [i] would yield (65, 185, 508)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 2549 561785 808799 245939 014238 717084 006518 128319 491357 110327 280997 024263 803469 442182 548772 862647 772974 756275 041600 > 4¹⁸⁵ [i]