Lógica e Ontologia no confronto entre Bertrand Russell e Hugh MacColl acerca dos objectos inexistentes

Moving from a technical, logical point of view in the Russell-MacColl debate about the existential import of propositions and the significance of the null-class, the paper tries to inquiry the relationship between logic and ontology, considering in special the case of non existing objects. Russell''s philosophical treatment of the existential quantification gains his full meaning in his realistic perspective. But it is possible to use this treatment versus Russell intentions, to deny that there is a supplementary (in space-time) existence, that "lies wholly outside Symbolic Logic"