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Sense/Frege: extramental entity. - ("Old" intension) - thought content, which is detected - on the other hand new intension/PutnamVsFrege: there are meaning differences that escape the intension - i.e. understanding not only by linking with intension - VsFrege: detecting only by representation, not 6th Sense - representation is determined by environment(twin earth).
Bracketing/Husserl: talk about what is going on in someone's head, without condition relating to actual nature of the objects - twin earth E.g. "belief that a glass of water is in front of him (namely for the believer himself, in full non-bracketed sense).
"Notional world"/Dennett: set of bracketed beliefs of a subject - reference of course is the actual substance (twin earth) - intension/tradition: notional world determines the intension - PutnamVs: this is wrong, therefore no uniform concept of meaning anymore.
Von einem Realistischen Standpunkt Frankfurt 1993
Repräsentation und Realität Frankfurt 1999
Für eine Erneuerung der Philosophie Stuttgart 1997
Pragmatismus Eine offene Frage Frankfurt 1995
Vernunft, Wahrheit und Geschichte Frankfurt 1990