theorem Th9: :: CONLAT_2:9

for C being FormalContext
for CP being strict FormalConcept of C holds "\/" ( { ConceptStr(# O,A #) where O is Subset of the carrier of C, A is Subset of the carrier' of C : ex o being Object of C st
( o in the Extent of CP & O = (AttributeDerivation C) . ((ObjectDerivation C) . {o}) & A = (ObjectDerivation C) . {o} ) } ,(ConceptLattice C)) = CP