MinT - Best Known (40, 40+129, s)-Nets in Base 4

Best Known (40, 40+129, s)-Nets in Base 4

(40, 40+129, 56)-Net over F₄ — Constructive and digital

Digital (40, 169, 56)-net over F₄, using

t-expansion [i] based on digital (33, 169, 56)-net over F₄, using
- net from sequence [i] based on digital (33, 55)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 33 and N(F) ≥ 56, using
    - F₅ from the tower of function fields by GarcÃa and Stichtenoth over F₄ [i]

(40, 40+129, 75)-Net over F₄ — Digital

Digital (40, 169, 75)-net over F₄, using

net from sequence [i] based on digital (40, 74)-sequence over F₄, using
- Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 40 and N(F) ≥ 75, using
  - Drinfeld modules of rank 1 [i]

(40, 40+129, 169)-Net over F₄ — Upper bound on s (digital)

There is no digital (40, 169, 170)-net over F₄, because

5 times m-reduction [i] would yield digital (40, 164, 170)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4¹⁶⁴, 170, F₄, 124) (dual of [170, 6, 125]-code), but
  - residual code [i] would yield linear OA(4⁴⁰, 45, F₄, 31) (dual of [45, 5, 32]-code), but
    - â€œLizâ€ bound on codes from Brouwerâ€™s database [i]

(40, 40+129, 263)-Net in Base 4 — Upper bound on s

There is no (40, 169, 264)-net in base 4, because

1 times m-reduction [i] would yield (40, 168, 264)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 162039 652719 005475 927663 590208 589082 047752 888334 214691 857214 192672 275810 784983 533993 018382 401598 218972 > 4¹⁶⁸ [i]