Moritz Schlick

Moritz Schlick (1882–1936) was a German philosopher and physicist who founded the Vienna Circle and helped shape logical empiricism.

Rudolf Carnap: A German-born philosopher who became a leading figure in logical empiricism and the Vienna Circle. Carnap joined Schlick’s circle and became its most prominent systematic philosopher.
Verification principle: The principle that a statement’s empirical meaning depends on how experience could confirm or disconfirm it. Schlick used verifiability to distinguish factual claims from metaphysical assertions.
Empiricism: The philosophical view that experience is a primary source of knowledge. Schlick’s account of scientific knowledge rests on the evidential authority of experience.
Vienna Circle: A group of philosophers and scientists in interwar Vienna who developed logical empiricism through regular discussions. Schlick founded and chaired the group that became the center of his philosophical activity.
Max Planck: A German theoretical physicist whose work on black-body radiation helped initiate quantum theory. Planck supervised Schlick’s doctoral work in physics at the University of Berlin.
Otto Neurath: An Austrian philosopher and sociologist known for his work in logical empiricism and the Vienna Circle. Neurath shared the Circle’s empiricist aims but challenged Schlick’s account of protocol statements.
Protocol sentence: A basic observational statement proposed as a starting point for empirical knowledge. Schlick’s debate with Neurath concerned whether observation reports could provide a secure foundation.
Logical empiricism: A philosophical movement that combined empiricism with modern logic to analyze scientific knowledge and language. Schlick helped establish the movement whose program his Circle made influential.
Unity of science: The program of integrating scientific knowledge through shared methods, language, or explanatory principles. The Circle’s project extended Schlick’s empiricism toward a common framework for the sciences.
Space and Time in Contemporary Physics: Schlick’s 1917 book explaining the philosophical implications of Einstein’s theory of relativity. This book established Schlick’s reputation as an interpreter of modern physics.

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