"When I met Wittgenstein, I saw that Schlick's warnings were fully justified. But his behavior was not caused by any a…"

"Logic is not concerned with human behavior in the same sense that physiology, psychology, and social sciences are con…"

"If we compare. e.g. the systems of classical mathematics and of intuitionistic mathematics, we find that the first is…"

"Philosophy is to be replaced by the logic of science -- that is to say, by the logical analysis of the concepts and s…"

"By the logical syntax of a language, we mean the formal theory of the linguistic forms of that language -- the system…"

"According to this view, the sentences of metaphysics are pseudo-sentences which on logical analysis are proved to be …"

"In order to determine whether or not one sentence is a consequence of another, no reference need be made to the meani…"

"Logic is the last scientific ingredient of Philosophy; its extraction leaves behind only a confusion of non-scientifi…"

"Science is a system of statements based on direct experience, and controlled by experimental verification. Verificati…"

"In science there are no 'depths'; there is surface everywhere."