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KripkeVsGeach: a sortal is certainly not a priori true by the designated object. It may yet turn out that it is: e.g. Lot’s guests, even if he names them, are not humans but angels. Then why should it belong to the meaning of the name?
Name und Notwendigkeit Frankfurt 1981
S. A. Kripke
Outline of a Theory of Truth (1975)
Recent Essays on Truth and the Liar Paradox, R. L. Martin (Hg), Oxford/NY 1984