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Acquaintance/Reduction/Reducibility/Russell/Hintikka: Russell only considered the quantifier of acquaintance as irreducible. This corresponds to the fact that he only considers logical names "this", etc. as real names.
Jaakko and Merrill B. Hintikka
The Logic of Epistemology and the Epistemology of Logic Dordrecht 1989
J. Hintikka/M. B. Hintikka
Untersuchungen zu Wittgenstein Frankfurt 1996