Logic

What Is a Logical Fallacy? The Recurring Errors of Argument

An introduction to logical fallacies — the systematic patterns of defective argument that appear sound — from Aristotle's sophistical refutations to modern informal logic and argumentation theory.

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What Is Deductive Reasoning? Certainty Through Logic

An introduction to deductive reasoning — inference in which the conclusion follows necessarily from the premises — from Aristotle's syllogism to modern formal logic and its applications.

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What Is Inductive Reasoning? Probable Conclusions from Evidence

An introduction to inductive reasoning — inference from observed cases to general conclusions — from Aristotle's epagoge through Hume's problem of induction to Bayesian and statistical approaches.

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What Is Logic? The Systematic Study of Valid Reasoning

An introduction to logic as the systematic study of valid inference — what it is, where it came from, and why it matters for reasoning, science, and everyday judgment.

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Clarity: Meaning, Philosophy & Wisdom

A philosophical exploration of clarity as the lucid grasp of thought, reality, and self, tracing it through Descartes' rationalist method, Wittgenstein's logical analysis, and the broader epistemological demand for transparent understanding.

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Rationality

A philosophical exploration of rationality as the capacity for reason-based thought and action, from Greek logos through Kantian reason to contemporary debates about bounded rationality.

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Reason

A comparative philosophical exploration of reason as the distinctive human faculty through Greek philosophy, Stoic living, and Kantian critical examination.

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William of Ockham

William of Ockham was an English Franciscan friar and medieval philosopher known for Occam's Razor, nominalism, and theological voluntarism, whose ideas shaped the transition from scholasticism to modern science.

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Gottlob Frege: Philosophy, Quotes & Legacy

Explore Gottlob Frege's philosophy, from the Begriffsschrift and the sense-reference distinction to his logicist program and his founding influence on analytic philosophy, philosophy of language, and modern logic.

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Charles Sanders Peirce: Philosophy, Quotes & Legacy

Explore Charles Sanders Peirce's philosophy of pragmatism, semiotics, and the pragmatic maxim. Discover the founder of American pragmatism and his theory of signs.

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Bertrand Russell

A comprehensive introduction to Bertrand Russell, the British philosopher who co-authored Principia Mathematica, developed the theory of descriptions, and shaped the analytic tradition through his work on logic, language, and knowledge.

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Ludwig Wittgenstein

Austrian-British philosopher who transformed twentieth-century thought through his work on language, logic, and the limits of what can be said.

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David Hume

Scottish philosopher whose empiricist investigation of knowledge, causation, and morality reshaped modern philosophy and provoked Kant's critical turn.

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Aristotle

An evidence-led introduction to Aristotle, the fourth-century BCE Greek philosopher whose work shaped ethics, logic, metaphysics, and accounts of human flourishing.

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Naming and Necessity

A philosophical guide to Saul Kripke's Naming and Necessity, examining rigid designation, proper names, natural kinds, and necessary a posteriori truths in language.

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Critique of Pure Reason

Immanuel Kant's 1781 investigation of the limits and conditions of human knowledge, establishing the critical philosophy that reshaped modern thought.

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Formal Logic

An introduction to formal logic — the branch of logic that studies argument forms using artificial languages, proof systems, and model-theoretic semantics, from the syllogism to predicate calculus and beyond.

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Informal Logic

An introduction to informal logic — the study of the norms of everyday argumentation, including fallacies, argument schemes, and the evaluation of reasoning in natural language.

philosophy

Philosophy of Logic

An introduction to the philosophy of logic — the study of the nature, scope, and foundations of logical truth, logical consequence, and the very idea of a system of valid inference.

philosophy

Philosophy of Mathematics

An introduction to the philosophy of mathematics, examining the nature of mathematical objects, the foundations of mathematical truth, and the debate between logicism, formalism, and intuitionism from Plato to Gödel.

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Logical Positivism

Logical Positivism is the early twentieth-century movement centered on the Vienna Circle that held that a statement is meaningful only if it is empirically verifiable or logically true, and that traditional metaphysics fails this test.

philosophy

Analytic Philosophy

An introduction to analytic philosophy, the tradition emphasizing logical analysis, language, and clarity, from Frege and Russell through Wittgenstein and Quine to the contemporary divide.

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Critical Thinking & Logic: A Learning Path Through Reasoning, Fallacies & Scientific Method

A structured learning path through critical thinking, logic, and scientific reasoning — from the laws of valid inference and common fallacies to the scientific method and the cognitive biases that undermine good judgment.

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Understanding Reality

A learning path through truth, knowledge, reality, and perception — from Plato to existential philosophy.

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