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On the Sources of Knowledge and of Ignorance
Conjectures and Refutations
The Nature of Philosophical Problems and their Roots
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accept Anaximander apply argument Aristotle assertion atomic attempt attitude believe calculus called Carnap confirmation conjecture contradictions criterion criticism definition Democritus Descartes described dialectic discovery discussion doctrine doubt Einstein empirical empiricism epistemology especially example experience explain fact false falsifiability formulated Hegel Heraclitus human hypothesis idea important induction instrumentalism interesting interpretation intuition irrefutable Kant Kant's kind knowledge language laws logical Marxism mathematical meaning meaningful meaningless ment metaphysical method mind mistaken myth nature negation Newton's theory observations Open Society Parmenides passage perhaps philosophical physical Plato possible precisely predictions Presocratics principle probability problem problem of demarcation problem of induction pure question rational rationalist realize reason refuted result rules of inference seems sense sentences social Socrates statements suggest testable tests Theaetetus theoretical thesis things tion tradition true truth valid verisimilitude Vienna Circle Wittgenstein's words Xenophanes