MinT - Best Known (206−150, 206, s)-Nets in Base 4

Best Known (206−150, 206, s)-Nets in Base 4

Digital (56, 206, 66)-net over F₄, using

t-expansion [i] based on digital (49, 206, 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]

Digital (56, 206, 91)-net over F₄, using

t-expansion [i] based on digital (50, 206, 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]

There is no digital (56, 206, 308)-net over F₄, because

2 times m-reduction [i] would yield digital (56, 204, 308)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4²⁰⁴, 308, F₄, 148) (dual of [308, 104, 149]-code), but
  - residual code [i] would yield OA(4⁵⁶, 159, S₄, 37), but
    - the linear programming bound shows that MÂ â‰¥ 552280 967540 130556 225380 165062 844509 113927 435157 299702 522905 668351 970980 659200 000000 / 99 260712 948022 423958 535222 844990 439800 493623 078423 > 4⁵⁶ [i]

There is no (56, 206, 373)-net in base 4, because

the generalized Rao bound for nets shows that 4^mÂ â‰¥ 10927 064276 334421 594119 307783 950990 068361 282000 632982 871681 078353 674483 393396 146253 049507 141300 446583 516699 711824 983978 251736 > 4²⁰⁶ [i]