The most influential semanticist in the recent history of logic and of philosophy of language did not believe in semantics and consequently left the most important part of his semantical ideas unexpressed. In the last hundred years, most of philosophical logic and of philosophical analysis has been deeply influenced, often virtually dominated, by the ideas of Gottlob Frege (in most cases as propagated by Russell; cf. e.g. [85]). Yet Frege left many of his own semantical assumptions undefended, unless the success of his overall approach is supposed to be its defense.