Wittgenstein and the Vienna Circle: Conversations

according affairs angles apply arithmetic axioms calculus chess circle colour complete induction completely different concept configuration connected consists construction contradiction corresponds dealing with signs define definition describe elementary propositions elements entirely different equation Euclidean geometry Euclidean space everything example exist experience expression fact finite formula Frege grammar Grundgesetze hence hypothesis imagine indirect proof induction inference infinite Königsberg logical constants logical product look mathematical induction mathematics matter means measuring-rod multiplicity negation nonsense object occurs ordinary language philosophy philosophy of mathematics picture points in space possible presupposes probability properties propo propositional form propositional function proved question rational numbers real numbers reality relation rules of chess rules of syntax Russell Schlick Schlick's house sense sition specify statement stipulation straight line structure substitution-rule such-and-such symbol tautology theory thing tion truth-functions understand variable verified Vienna Vienna Circle visual field WAISMANN ASKS Wittgenstein word