MinT - Best Known (42, 42+6, s)-Nets in Base 9

Best Known (42, 42+6, s)-Nets in Base 9

(42, 42+6, 5593242)-Net over F₉ — Constructive and digital

Digital (42, 48, 5593242)-net over F₉, using

(u,Â u+v)-construction [i] based on
1. digital (3, 6, 840)-net over F₉, using
  - net defined by OOA [i] based on linear OOA(9⁶, 840, F₉, 3, 3) (dual of [(840, 3), 2514, 4]-NRT-code), using
    - appending kth column [i] based on linear OOA(9⁶, 840, F₉, 2, 3) (dual of [(840, 2), 1674, 4]-NRT-code), using
      - OAs with strength 3, bÂ â‰ Â 2, and mÂ >Â 3 are always embeddable [i] based on linear OA(9⁶, 840, F₉, 3) (dual of [840, 834, 4]-code or 840-cap in PG(5,9)), using
        large caps in PG(5,Â b) [i]
2. digital (36, 42, 5592402)-net over F₉, using
  - trace code for nets [i] based on digital (15, 21, 2796201)-net over F₈₁, using
    - net defined by OOA [i] based on linear OOA(81²¹, 2796201, F₈₁, 6, 6) (dual of [(2796201, 6), 16777185, 7]-NRT-code), using
      - OA 3-folding and stacking [i] based on linear OA(81²¹, large, F₈₁, 6) (dual of [large, large−21, 7]-code), using
        the expurgated narrow-sense BCH-code C(I) with length 21523360Â | 81⁴âˆ’1, defining interval IÂ =Â [0,5], and designed minimum distance dÂ â‰¥Â |I|+1Â =Â 7 [i]

(42, 42+6, large)-Net over F₉ — Digital

Digital (42, 48, large)-net over F₉, using

9¹ times duplication [i] based on digital (41, 47, large)-net over F₉, using
- t-expansion [i] based on digital (40, 47, large)-net over F₉, using
  - Gilbertâ€“VarÅ¡amov bound [i]

(42, 42+6, large)-Net in Base 9 — Upper bound on s

There is no (42, 48, large)-net in base 9, because

4 times m-reduction [i] would yield (42, 44, large)-net in base 9, but
- mutually orthogonal hypercube bound [i]