MinT - Best Known (71, 71+175, s)-Nets in Base 4

Best Known (71, 71+175, s)-Nets in Base 4

Digital (71, 246, 66)-net over F₄, using

t-expansion [i] based on digital (49, 246, 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 (71, 246, 105)-net over F₄, using

t-expansion [i] based on digital (70, 246, 105)-net over F₄, using
- net from sequence [i] based on digital (70, 104)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 70 and N(F) ≥ 105, using
    - Drinfeld modules of rank 1 [i]

There is no digital (71, 246, 454)-net over F₄, because

3 times m-reduction [i] would yield digital (71, 243, 454)-net over F₄, but
- extracting embedded orthogonal array [i] would yield linear OA(4²⁴³, 454, F₄, 172) (dual of [454, 211, 173]-code), but
  - residual code [i] would yield OA(4⁷¹, 281, S₄, 43), but
    - the linear programming bound shows that MÂ â‰¥ 373 183646 729416 144099 480364 087718 649481 545879 174441 862191 129687 019685 715860 929497 289195 520000 / 66 442053 478467 341276 388448 356669 192467 605369 216717 > 4⁷¹ [i]

There is no (71, 246, 481)-net in base 4, because

1 times m-reduction [i] would yield (71, 245, 481)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 3732 618276 388640 072891 390463 460252 520683 786683 378365 430818 150526 985302 744103 317063 380512 779201 975289 799902 354789 897726 632601 474988 910295 144349 284000 > 4²⁴⁵ [i]