Metaphysics, Epistemology & History of Philosophy

Abductive reasoning proposes or evaluates hypotheses by considering how well they explain observed evidence, without guaranteeing that the conclusions are true.

A philosophical tradition emphasizing explicit argument, conceptual clarity, and logical analysis, originating in the late nineteenth and early twentieth centuries.

A philosophical distinction between truths grounded in meaning or concepts and claims whose content goes beyond them.

Aristotle was an ancient Greek philosopher whose investigations of reasoning, nature, ethics, and politics shaped intellectual traditions across many centuries.

German philosopher whose account of reality as will shaped philosophical pessimism, aesthetics, and the ethics of compassion.

Seventeenth-century Dutch philosopher whose naturalistic system united metaphysics, ethics, biblical criticism, and political theory.

Causation is the relationship through which events, conditions, or processes produce or influence other events, conditions, or processes.

A thought experiment challenging whether executing a computer program is sufficient for genuine understanding.

Classical logic is a family of formal systems that represents deductive consequence through standard two-valued semantics and corresponding rules of proof.

Coherentism holds that beliefs are epistemically justified through their relations of support within a coherent system, rather than through an independent foundation.

Confucianism is an intellectual and cultural tradition originating in China, centered on moral cultivation, ritual propriety, and social responsibility.

The subjective, first-person experience of awareness, and the philosophical and scientific attempts to explain how brains, and possibly machines, produce it.

A counterfactual considers what would or might be the case under circumstances different from those that actually obtain.

Daoism is a Chinese intellectual tradition associated chiefly with Laozi and Zhuangzi, centered on the Dao, naturalness, and nonaction.

David Hume was a Scottish philosopher and historian whose accounts of knowledge, causation, morality, and religion shaped modern philosophy.

Reasoning that aims to establish conclusions necessarily following from premises, evaluated through logical validity and the truth of those premises.

Democritus was an ancient Greek philosopher who developed atomism and explored knowledge, ethics, mathematics, and the origins of the natural world.

Empiricism is a family of philosophical views that treats experience as the principal source of concepts, knowledge, or justification.

Epistemic justification is the status of a belief supported by adequate reasons, evidence, or suitably truth-conducive processes.

Epistemology is the philosophical study of knowledge, justification, and rational belief, including their sources, limits, and social conditions.

Existentialism explores human existence through freedom, responsibility, finitude, and the situated pursuit of meaning.

An experiment is a systematic investigation that manipulates conditions and measures outcomes to test explanations, estimate effects, or explore phenomena.

A fallacy is a defect in reasoning or argumentation, involving invalid inference, inadequate evidence, unjustified assumptions, or violations of appropriate argumentative standards.

Falsifiability is the capacity of a claim or theory to conflict with possible empirical evidence, proposed by Karl Popper as a criterion of scientific status.

Foundationalism is the epistemological view that knowledge or justified belief ultimately depends on beliefs justified independently of other beliefs.

Francis Bacon was an English philosopher, statesman, and essayist whose program of experimental inquiry and institutional cooperation helped shape early modern science.

Friedrich Nietzsche (1844–1900) was a German philosopher and philologist whose critiques of morality, truth, and religion reshaped modern thought, though his aphoristic works won little attention in his lifetime.

German mathematician, logician, and philosopher whose work established modern predicate logic and transformed the philosophy of mathematics and language.

A hypothesis is a proposed explanation or claim evaluated through reasoning, observation, or empirical testing.

Immanuel Kant was a German philosopher whose critical philosophy examined the conditions of knowledge, moral obligation, and aesthetic judgment.

Inductive reasoning draws conclusions beyond what its premises logically guarantee, using evidence to support generalizations, predictions, and hypotheses.

French philosopher, novelist, and playwright whose existentialism connected freedom, responsibility, literature, and political engagement.

English philosopher whose writings on knowledge, government, religious toleration, and education shaped modern thought.

Karl Popper was an Austrian-born British philosopher known for falsifiability, critical rationalism, and his defense of the open society.

Knowledge is an epistemic achievement involving facts, practical abilities, or acquaintance, whose nature, sources, and limits are studied in philosophy.

Logic studies valid inference, the structure of arguments, and formal systems for representing and evaluating reasoning.

Logical consequence is the relation in which a conclusion follows from premises by logic alone, formalized through semantic entailment or deductive derivability.

A twentieth-century philosophical movement that combined empirical inquiry with logical analysis to clarify scientific knowledge, language, and method.

Logical validity is the property of an argument whose conclusion necessarily follows from its premises, or of a formula true under every admissible interpretation.

Austrian-born British philosopher whose early and later writings transformed twentieth-century thinking about language, logic, meaning, and philosophical method.

Material implication is the truth-functional conditional of classical logic, false only when its antecedent is true and its consequent is false.

Metaphysics is the branch of philosophy concerned with existence, reality’s fundamental structure, and the relations among objects, properties, causes, space, and time.

Modal logic studies reasoning about necessity, possibility, and related notions such as knowledge, obligation, time, and action.

Philosophical skepticism questions whether knowledge or justified belief is attainable, either generally or within particular domains.

Philosophy investigates fundamental questions about reality, knowledge, reasoning, value, and human life through critical reflection and argument.

Philosophy of language investigates meaning, reference, truth, linguistic understanding, and the relationship between language, thought, and social practice.

Philosophy of mind studies mental phenomena, their relationship to the physical world, and the nature of consciousness, thought, and agency.

Philosophy of science examines scientific knowledge, methods, explanations, and the relationship between scientific inquiry and reality.

Plato was an ancient Greek philosopher whose dialogues and Academy shaped enduring debates about knowledge, reality, ethics, and political order.

Possible worlds represent complete ways reality could have been and provide a framework for analyzing possibility, necessity, and counterfactual claims.

A constellation of artistic and intellectual movements questioning modernist conventions, universal narratives, originality, and cultural hierarchies.

The problem of induction asks what justifies extending observed regularities to unobserved cases, given that neither deduction nor appeals to past success straightforwardly establish their reliability.

Rationalism is the philosophical view that reason supplies some knowledge or concepts independently of sensory experience, especially in mathematics and metaphysics.

René Descartes was a French philosopher, mathematician, and scientific thinker whose work shaped modern philosophy and analytic geometry.

Reproducibility is the capacity to obtain consistent research results by repeating documented procedures, particularly computations using the same data and methods.

German-born American philosopher who developed logical empiricism, formal semantics, and probabilistic accounts of scientific confirmation.

The scientific method is a set of procedures for building knowledge about nature. It relies on observation, testable hypotheses, controlled experiments and critical review by other researchers.

Socrates was an Athenian philosopher whose questioning of moral beliefs, trial, and execution profoundly influenced Western philosophy.

Soundness characterizes valid arguments with true premises and proof systems whose derivations preserve semantic consequence.

A deductive argument traditionally consisting of two premises and a conclusion, central to Aristotle’s logic and later theories of inference.