I expressed agreement with Unger's view of the essential\nnature of personal identity, but dissented from what I took\nto be his view of the value we attach to its preservation;\nsaying, for example, that, in common, I think with many\nothers, I would prefer being replaced or succeeded' by a\nnumerically distinct continuator' with "qualitatively"\nidentical memories and mental and physical characteristics\nto surviving as the "numerically" identical person with\nsevere impairment of memory and abilities.

Referindo-se ao capítulo 6 da minha Introduction to Logical Theory, o professor Calabria demonstra de modo correto e sistemático que, tal como exposta, a doutrina da pressuposição implica uma concepção da lógica que é substancialmente desviante tanto no que diz respeito à lógica tradicional como à lógica moderna clássica.