MinT - Best Known (240−162, 240, s)-Nets in Base 3

Best Known (240−162, 240, s)-Nets in Base 3

(240−162, 240, 53)-Net over F₃ — Constructive and digital

Digital (78, 240, 53)-net over F₃, using

net from sequence [i] based on digital (78, 52)-sequence over F₃, using
- base reduction for sequences [i] based on digital (13, 52)-sequence over F₉, using
  - s-reduction based on digital (13, 63)-sequence over F₉, using
    - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₉ with g(F) = 13 and N(F) ≥ 64, using
      - a function field by GarcÃa and Quoos [i]

(240−162, 240, 84)-Net over F₃ — Digital

Digital (78, 240, 84)-net over F₃, using

t-expansion [i] based on digital (71, 240, 84)-net over F₃, using
- net from sequence [i] based on digital (71, 83)-sequence over F₃, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₃ with g(F) = 71 and N(F) ≥ 84, using
    - algebraic function fields over â„¤₃ by Niederreiter/Xing [i]

(240−162, 240, 244)-Net over F₃ — Upper bound on s (digital)

There is no digital (78, 240, 245)-net over F₃, because

extracting embedded orthogonal array [i] would yield linear OA(3²⁴⁰, 245, F₃, 162) (dual of [245, 5, 163]-code), but
- 1 times code embedding in larger space [i] would yield linear OA(3²⁴¹, 246, F₃, 162) (dual of [246, 5, 163]-code), but
  - Griesmer bound [i]

(240−162, 240, 326)-Net in Base 3 — Upper bound on s

There is no (78, 240, 327)-net in base 3, because

the generalized Rao bound for nets shows that 3^mÂ â‰¥ 3 255816 554478 392200 305356 401215 398989 950007 421100 728901 972758 238713 339100 613999 259422 768393 663797 672223 135284 385775 > 3²⁴⁰ [i]