MinT - Best Known (43, 43+131, s)-Nets in Base 4

Best Known (43, 43+131, s)-Nets in Base 4

(43, 43+131, 56)-Net over F₄ — Constructive and digital

Digital (43, 174, 56)-net over F₄, using

t-expansion [i] based on digital (33, 174, 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]

(43, 43+131, 75)-Net over F₄ — Digital

Digital (43, 174, 75)-net over F₄, using

t-expansion [i] based on digital (40, 174, 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]

(43, 43+131, 181)-Net over F₄ — Upper bound on s (digital)

There is no digital (43, 174, 182)-net over F₄, because

3 times m-reduction [i] would yield digital (43, 171, 182)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4¹⁷¹, 182, F₄, 128) (dual of [182, 11, 129]-code), but
  - constructionÂ Y1 [i] would yield
    1. linear OA(4¹⁷⁰, 176, F₄, 128) (dual of [176, 6, 129]-code), but
      - constructionÂ Y1 [i] would yield
        linear OA(4¹⁶⁹, 173, F₄, 128) (dual of [173, 4, 129]-code), but
        Griesmer bound [i]
        linear OA(4⁶, 176, F₄, 3) (dual of [176, 170, 4]-code or 176-cap in PG(5,4)), but
        discarding factors / shortening the dual code would yield linear OA(4⁶, 160, F₄, 3) (dual of [160, 154, 4]-code or 160-cap in PG(5,4)), but
        1 times Hill recurrence [i] would yield linear OA(4⁵, 42, F₄, 3) (dual of [42, 37, 4]-code or 42-cap in PG(4,4)), but
        41 is the largest size of a cap in PG(4,Â 4) [i]
    2. OA(4¹¹, 182, S₄, 6), but
      - discarding factors would yield OA(4¹¹, 99, S₄, 6), but
        the Rao or (dual) Hamming bound shows that MÂ â‰¥ 4 278880 > 4¹¹ [i]

(43, 43+131, 283)-Net in Base 4 — Upper bound on s

There is no (43, 174, 284)-net in base 4, because

1 times m-reduction [i] would yield (43, 173, 284)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 156 024953 522355 184193 851633 549923 292073 587819 196998 391456 611388 376763 141863 297659 427579 355849 057672 496380 > 4¹⁷³ [i]