MinT - Best Known (236−176, 236, s)-Nets in Base 4

Best Known (236−176, 236, s)-Nets in Base 4

(236−176, 236, 66)-Net over F₄ — Constructive and digital

Digital (60, 236, 66)-net over F₄, using

t-expansion [i] based on digital (49, 236, 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]

(236−176, 236, 91)-Net over F₄ — Digital

Digital (60, 236, 91)-net over F₄, using

t-expansion [i] based on digital (50, 236, 91)-net over F₄, using
- net from sequence [i] based on digital (50, 90)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 50 and N(F) ≥ 91, using
    - a curve from the manYPoints database [i]

(236−176, 236, 257)-Net over F₄ — Upper bound on s (digital)

There is no digital (60, 236, 258)-net over F₄, because

extracting embedded orthogonal array [i] would yield linear OA(4²³⁶, 258, F₄, 176) (dual of [258, 22, 177]-code), but
- residual code [i] would yield OA(4⁶⁰, 81, S₄, 44), but
  - the linear programming bound shows that MÂ â‰¥ 278 016363 629983 093645 810481 419845 575227 299067 854848 / 143 941903 015625 > 4⁶⁰ [i]

(236−176, 236, 391)-Net in Base 4 — Upper bound on s

There is no (60, 236, 392)-net in base 4, because

the generalized Rao bound for nets shows that 4^mÂ â‰¥ 12743 436253 129723 971865 259562 004804 563523 382763 335250 760150 153795 514541 214847 422024 964336 887255 025780 247588 638680 067597 773919 431010 895614 058160 > 4²³⁶ [i]