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Cogito/Skepticism/Hintikka: the convincing force of the perspective (subject-centered) identification cannot be transferred to the public case. ((s) That is, Descartes is only aware to himself and cannot prove his existence to others).
Self awareness/Hintikka: But he did achieve self awareness.
False: even from Descartes' own mouth, "I think, so Descartes exists" would be a bad joke.
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