MinT - Best Known (68, 68+161, s)-Nets in Base 4

Best Known (68, 68+161, s)-Nets in Base 4

(68, 68+161, 66)-Net over F₄ — Constructive and digital

Digital (68, 229, 66)-net over F₄, using

t-expansion [i] based on digital (49, 229, 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+161, 99)-Net over F₄ — Digital

Digital (68, 229, 99)-net over F₄, using

t-expansion [i] based on digital (61, 229, 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+161, 466)-Net in Base 4 — Upper bound on s

There is no (68, 229, 467)-net in base 4, because

1 times m-reduction [i] would yield (68, 228, 467)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 186510 639571 144261 804206 568164 397710 035365 073936 030387 926563 038425 566513 259937 236590 595130 704918 495529 351975 049967 534730 879894 714619 578011 > 4²²⁸ [i]