|Kripke's Wittgenstein: Interpretation by Saul A. Kripke of a problem by L. Wittgenstein in connection with the rule series. Kripke extends Wittgenstein's doubts about the security with which we judge our own opinion. If we only believe to follow rules, we do not know for sure what we mean by addition. From a finite series of cases in the past, no certainty about future cases can be gained. The core of the problem is, according to Kripke, that there are no facts that determine the importance of our own beliefs._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments.