fact: Definition reduced (D : seq (G * K)) := uniq [seq zx.2 | zx <- D] && all [pred zx | zx.1 != 0] D.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(fintype bigop order generic_quotient) mathcomp(ssralg ssrnum ssrint)