fact: Definition stab_iporbits s : {set {perm {set T}}} := Sym (porbits s) :&: \bigcap_(i : 'I_#|T|.+1) 'N(porbits s :&: 'SC_i | 'P).
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq fintype) mathcomp(tuple path bigop finset div) mathcomp(fingroup perm action gproduct morphism) tools partition permcomp cycles cycletype