Mr Copi on Objects, Properties, and Relations in the ‘Tractatus' 1

i agree with some of what Mr Copi says. But he has no justification for asserting that according to the Tractatus ‘the fact that aRb contains exactly two elements’—namely the objects a and b. All that the Tractatus tells him is that the objects a and b occur ‘in the sense’ of the proposition ‘aRb’ (4.1211). 50 or 1000 or an infinity of other objects may occur in that sense as well.