Size-63 (= 7 × 9) right-cancellative fiber bundle: F_7(4, 3) base × F_9(3, 7) fiber, in the "twisted" Family B variant. The 63 elements partition into 7 fibers of 9 (a non-trivial congruence with F_7 quotient), but only ONE fiber is itself a sub-magma — the fiber at the F_7-idempotent coset, isomorphic to F_9(3, 7). The other 6 fibers are non-closed congruence classes. Quasigroup (LC + RC) with a unique idempotent.
dwrensha · 2026-04-29 15:45:47