Austrian-British philosopher who proposed falsificationism as the criterion of scientific demarcation, argued against Marxism and Freudianism as unfalsifiable pseudosciences, and defended liberal democracy against historicist theories of history.
Falsificationism: a theory is scientific if and only if it is falsifiable — it makes predictions that could in principle be proven false. The Logic of Scientific Discovery: replaces induction with the hypothetico-deductive method. The Open Society and Its Enemies: a critique of Plato, Hegel, and Marx as proto-totalitarian historicists. The three-world ontology.
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