proper part of continuant at all times properContinuantPartOfAt http://purl.obolibrary.org/obo/bfo.owl c-ppart-of_at (iff (properContinuantPartOfAt a b t) (and (continuantPartOfAt a b t) (not (= a b)))) // axiom label in BFO2 CLIF: [004-001] Alan Ruttenberg: This is a binary version of a ternary time-indexed, instance-level, relation. The BFO reading of the binary relation 'proper part of continuant at all times@en' is: forall(t) exists_at(x,t) -> exists_at(y,t) and 'proper part of continuant@en(x,y,t)'. b proper_continuant_part_of c at t =Def. b continuant_part_of c at t & b and c are not identical. (axiom label in BFO2 Reference: [004-001]) part of continuant at all times has continuant part at all times that part exists