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KripkeVsGeach: a sortal is certainly not a priori true of the designated object. It could turn out: E.g. Lot's guests, even if he calls them, are not people, 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