Let M = F_11 x F_7, let
Q = {1,3,4,5,9},
c_i = 1 if i = 1, and c_i = 0 if i != 1,
and define
(i,s) * (j,t) = (6i + 6j, H_ij(s,t)),
where
H_ij(s,t) =
4s + t + c_i, if i = j,
t, if j - i in Q,
-s - t, if j - i notin Q union {0}.
First coordinates are calculated modulo 11, second coordinates modulo 7.
omegaestable · 2026-09-20 15:20:24