MinT - Best Known (254−193, 254, s)-Nets in Base 4

Best Known (254−193, 254, s)-Nets in Base 4

(254−193, 254, 66)-Net over F₄ — Constructive and digital

Digital (61, 254, 66)-net over F₄, using

t-expansion [i] based on digital (49, 254, 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]

(254−193, 254, 99)-Net over F₄ — Digital

Digital (61, 254, 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]

(254−193, 254, 254)-Net over F₄ — Upper bound on s (digital)

There is no digital (61, 254, 255)-net over F₄, because

9 times m-reduction [i] would yield digital (61, 245, 255)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4²⁴⁵, 255, F₄, 184) (dual of [255, 10, 185]-code), but
  - residual code [i] would yield linear OA(4⁶¹, 70, F₄, 46) (dual of [70, 9, 47]-code), but
    - â€œGurâ€ bound on codes from Brouwerâ€™s database [i]

(254−193, 254, 395)-Net in Base 4 — Upper bound on s

There is no (61, 254, 396)-net in base 4, because

1 times m-reduction [i] would yield (61, 253, 396)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 250 490244 645972 728481 131110 625038 694398 597633 273834 771231 119463 371731 451759 229459 934150 736728 780270 942741 692945 581582 759906 035436 620186 369106 856210 874836 > 4²⁵³ [i]