:: deftheorem Def17 defines B-meet CONLAT_1:def 18 :
for C being FormalContext
for b₂ being BinOp of (B-carrier C) holds
( b₂ = B-meet C iff for CP1, CP2 being strict FormalConcept of C ex O being Subset of the carrier of C ex A being Subset of the carrier' of C st
( b₂ . (CP1,CP2) = ConceptStr(# O,A #) & O = the Extent of CP1 /\ the Extent of CP2 & A = (ObjectDerivation C) . ((AttributeDerivation C) . ( the Intent of CP1 \/ the Intent of CP2)) ) );