
theorem
  for C being FormalContext for o being Object of C for a being
  Attribute of C holds (gamma(C)).o is FormalConcept of C & (delta(C)).a is
  FormalConcept of C
proof
  let C be FormalContext;
  let o be Object of C;
  let a be Attribute of C;
  ConceptLattice(C) = LattStr(#B-carrier(C),B-join(C),B-meet(C)#) by
CONLAT_1:def 20;
  hence thesis by CONLAT_1:def 15;
end;
