theorem :: WAYBEL35:6

for L being 1-sorted
for R being Relation of the carrier of L
for C being strict_chain of R holds
( Strict_Chains (R,C) is_inductive_wrt RelIncl (Strict_Chains (R,C)) & ex D being set st
( D is_maximal_in RelIncl (Strict_Chains (R,C)) & C c= D ) )