MinT - Best Known (257−137, 257, s)-Nets in Base 4

Best Known (257−137, 257, s)-Nets in Base 4

(257−137, 257, 130)-Net over F₄ — Constructive and digital

Digital (120, 257, 130)-net over F₄, using

t-expansion [i] based on digital (105, 257, 130)-net over F₄, using
- net from sequence [i] based on digital (105, 129)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 105 and N(F) ≥ 130, using
    - T₇ from the second tower of function fields by GarcÃa and Stichtenoth over F₄ [i]

(257−137, 257, 168)-Net over F₄ — Digital

Digital (120, 257, 168)-net over F₄, using

t-expansion [i] based on digital (115, 257, 168)-net over F₄, using
- net from sequence [i] based on digital (115, 167)-sequence over F₄, using
  - Niederreiterâ€“Xing sequence constructionÂ II/III [i] based on function field F/F₄ with g(F) = 115 and N(F) ≥ 168, using
    - Drinfeld modules of rank 1 [i]

(257−137, 257, 1555)-Net in Base 4 — Upper bound on s

There is no (120, 257, 1556)-net in base 4, because

1 times m-reduction [i] would yield (120, 256, 1556)-net in base 4, but
- the generalized Rao bound for nets shows that 4^mÂ â‰¥ 13810 666572 493895 603715 086966 773635 482513 500600 743794 212137 126221 163102 736015 209586 293568 766901 550016 775083 479845 121451 150616 503982 677773 355045 762577 642016 > 4²⁵⁶ [i]