moved b.ll18 → RelationProperties.paste_sub_Un, b.ll21 → RelationProperties.paste_Range, and simplified their proofs
moved b.ll30 → RelationProperties.Image_runiq_eq_eval, a.l25 → RelationProperties.eval_runiq_rel
moved b.ll31 → RelationProperties.disj_Image_imp_disj_Domain
moved b.ll36 → RelationProperties.Domain_conv_Range
moved b.ll38 → RelationProperties.Range_outside_sub_Image_Domain
listing @caminati as first author