fact: Definition empty_hemi_graph : hemi_comp_graph port := @Build_hemi_comp_graph _ set0 (trivIset0 _) set0 (sub0set _).
imports: mathcomp(all_ssreflect ssralg fingroup zmodp poly ssrnum) mathcomp(matrix perm) ssr_ext ssralg_ext fdist subgraph_partition tanner