fact: Record hypRabc R a b c := HypRabc { Rtrans : transitive R; Hbc : R b c; Hba : ~~ R b a; Hxba : forall l, R l a -> R l b; Hbax : forall l, R b l -> R a l }.
imports: mathcomp(all_ssreflect) mathcomp(perm) tools ordcast ordtype subseq partition tableau Yamanouchi stdtab Schensted congr plactic Greene