Philosophy

Philo of Alexandria: Jewish Philosopher and Interpreter of Scripture Philo of Alexandria Philo of Alexandria (c. 20 BCE–c. 50 CE) was a Hellenistic Jewish thinker who harmonized Torah interpretation with Greek philosophy using allegory and the concept of the Logos.

Philo of Byzantium (Philo Mechanicus): Hellenistic engineer and author Philo of Byzantium Greek engineer and writer (c. 280–220 BC) best known for the multi-volume Mechanike syntaxis, which treated machines, siegecraft and mechanical principles and influenced later tech…

Philolaus of Croton Philolaus Philolaus (c.480–c.385 BC) was a Pythagorean philosopher associated with early Greek cosmology and number-based metaphysics; he proposed a non-geocentric model with a Central Fire…

Philosopher's Stone: alchemical concept, history and cultural legacy Philosopher's Stone Legendary alchemical substance believed to transmute base metals into gold and to grant rejuvenation or immortality; influential in the history of chemistry, religion, and literatu…

Philosophy: scope, methods, and historical development Philosophy A concise overview of philosophy: its core questions, major branches, methods, historical shifts, practical roles, and how it differs from related disciplines.

Philosophy of Language: Meaning, Reference, and Communication Philosophy of language An overview of the philosophy of language: its central questions, main concepts, historical development, methods, and practical importance in areas from translation to cognitive sc…

Philosophy of Mathematics: Nature, Major Views, and Significance Philosophy of mathematics An introduction to the philosophy of mathematics: what mathematical objects are, main positions (Platonism, formalism, intuitionism, structuralism), history, key questions, and pra…

Philosophy of Religion: Questions, Methods, and Key Themes Philosophy of religion The branch of philosophy that examines religious ideas, practices, arguments about God, the problem of evil, definitions of religion, and their social and intellectual roles.

Philosophy of Science: Questions, Methods, and Historical Development Philosophy of science The philosophy of science examines how scientific knowledge is produced, evaluated, and used. It addresses explanation, method, theory choice, realism, and the historical developme…

Philosophy of the World (The Shaggs album) Philosophy of the World Debut 1969 album by The Shaggs. Long dismissed as inept, it became an influential outsider-music cult classic after a 1980 reissue; known for naïve performances, unusual rhythms an…

Plato: Athenian philosopher and founder of the Academy Plato Plato (c. 427–347 BC) was an ancient Athenian thinker whose dialogues, theory of Forms, and the Academy shaped Western philosophy, political theory, and approaches to knowledge.

Platonic (relating to Plato, his philosophy, and derived uses) Platonic Pertaining to the ancient Greek philosopher Plato and concepts derived from his work: the Theory of Forms, Platonic love and friendship, Platonic solids, the Academy, and later Neo…

Platonic love: non-sexual affection and its origins Platonic love Platonic love describes deep, non-sexual affection and friendship. Rooted in Platonic philosophy, the concept evolved into modern ideas of close emotional bonds, mentorships, and q…

Platonic realism Philosophical view, originating with Plato, that abstract Forms or Ideas are more real than their physical instances and ground the intelligible structure of the world.

Pluralism: concept, varieties, and significance Pluralism Pluralism is the recognition and coexistence of multiple principles, groups, or perspectives within a system—applied in politics, philosophy, religion, law and culture to describe…

Point of view: perspectives in thought, language, and narrative Point of view Point of view (POV) denotes a particular perspective from which information, events, or ideas are considered. It appears in argumentation, journalism, literature, grammar, and visu…

Polemic: forceful argument and rhetorical controversy Polemic A polemic is a forceful, one-sided argument attacking an opinion, doctrine, or person. This article explains its features, history, uses, techniques and how it differs from debate…

Political philosophy: principles, history, and public significance Political philosophy An introduction to political philosophy: its central questions, basic concepts, historical development, practical uses, and how it differs from related disciplines.

Positivism: philosophy of empirical knowledge and its development Positivism Positivism is the philosophical stance that knowledge should be grounded in observable data and scientific method. This article explains its principles, history, applications, vari…

Post-postmodernism: emerging movements after postmodernism Post-postmodernism Post-postmodernism refers to a loose set of cultural developments reacting to postmodernism, emphasizing renewed sincerity, engagement, and practical concerns across art, literatur…

Postmodern Thought: Cultural, Philosophical, and Artistic Perspectives Postmodernism Overview of postmodern thought across culture, philosophy, and art—its skepticism of grand narratives, view of knowledge as socially constructed, and influence on literature, archi…

Pragmatism (philosophical tradition) Pragmatism Pragmatism is a philosophical movement that assesses ideas by their practical consequences and usefulness, emphasizing inquiry, fallibilism, and the link between thought and action…

Prajna — Buddhist Wisdom and Insight Prajna Prajna (Sanskrit: prajñā; Pali: paññā) denotes liberating wisdom in Buddhism, a central aim of practice and a core element of the Noble Eightfold Path and Mahāyāna teachings.

Pre-Socratic Philosophy Early Greek thinkers before Socrates who sought natural explanations for the world; known chiefly from fragments preserved in later authors and influential in the rise of rational…

Premise (logic and argumentation) Premise A premise is a proposition offered to support a conclusion. This article explains its role in reasoning, common types, historical background, practical examples, and the distinctio…

Principia Discordia: The Discordian Text of Chaos and Parody Principia Discordia Foundational, satirical scripture of Discordianism by Greg Hill and Kerry Thornley (1965). A collage-like manifesto blending parody, symbols (Law of Fives, Sacred Chao), and counte…

Problem of Evil An overview of the philosophical and theological problem of evil: definitions, historical development, main formulations (moral vs natural; logical vs evidential), standard respons…

Prophylaxis Prophylaxis: measures and practices intended to prevent disease, injury, or other adverse outcomes, spanning medical, public health, and everyday contexts.

Prophylactic moves in chess — anticipating and preventing opponent plans Prophylaxis (chess) Guide to prophylactic moves in chess: learn how quiet preventive moves anticipate and limit opponent plans, with examples, Nimzowitsch's ideas, and practical tips to reduce counter…

Proposition (philosophy and logic) Proposition A proposition is the meaning or content of a declarative statement that can be true or false; it is central to logic, semantics, and the philosophy of language and mind.

Proverb: concise traditional sayings of folk wisdom Proverb A proverb is a short, commonly repeated saying that expresses traditional wisdom, moral guidance, or practical advice; found across cultures and studied as part of language and fol…

Pythagoreanism: Philosophy, Practices, and Historical Influence Pythagoreanism Ancient philosophical and religious movement linking reality to numbers; combined mathematics, cosmology, ethics and communal practices and later reappeared as Neopythagoreanism.

Qi (Chi, Ki): The Chinese concept of vital energy Qi Qi (also written chi or ki) is a central notion in Chinese thought and medicine referring to circulating life energy; it informs practices like acupuncture, qigong, tai chi and fen…

Qualia (philosophy of mind) Qualia Qualia are the subjective, first‑person aspects of conscious experience — the felt qualities of sensations such as pain, color, or taste, central to debates in philosophy of mind a…

Quid pro quo: meaning, history, and uses Quid pro quo Quid pro quo is a Latin expression meaning 'something for something.' This article explains its literal sense, history, legal and social uses, examples, and distinctions from relat…

Ralph Waldo Emerson American essayist, lecturer, and leading voice of 19th-century Transcendentalism; promoted individualism, nature-centered spirituality, and influential literary essays such as "Nat…

Rationalism: reason, knowledge, and the philosophical tradition Rationalism Rationalism is the epistemological stance that reason is a primary source of knowledge; it shaped early modern philosophy, influenced natural law and deism, and contrasts with empi…

Rationality: Reasoned Thought, Decision-Making, and Practical Use Rationality Rationality is the practice of using reason and relevant information to form beliefs and make choices. This article explains types, features, history, applications, limits, and com…

Raven paradox (Hempel's paradox of confirmation) Raven paradox A philosophical puzzle about confirmation: how observations of non-black non-ravens seem to confirm 'All ravens are black', and how that challenges simple ideas about induction.

Red herring (fallacy and literary device) Red herring A red herring is a misleading or distracting element used in argument, rhetoric, and fiction. This article explains its forms, history, examples, detection, and how it differs from…

Reductio ad Hitlerum (playing the Hitler card) Reductio ad Hitlerum A rhetorical fallacy that rejects an idea by associating it with Hitler or Nazism; explains form, history, examples, how to recognize it, and how it differs from legitimate histori…

Relativism (philosophical concept) Relativism Relativism is the view that truth, value, or moral judgments are not absolute but depend on perspectives, cultures, languages, or frameworks.

Relevance: concept, uses, and measures across disciplines Relevance Relevance denotes the degree to which one piece of information or a topic bears on another. This article explains its meanings, applications in logic, information retrieval, cognit…

Right to Die: Concepts, Forms, Ethical Debates and Legal Safeguards Right to die Overview of the right to die: definitions, main forms (suicide, assisted suicide, euthanasia, refusing treatment), ethical and legal debates, religious views and common safeguards…

Robert Spaemann — German Catholic philosopher and ethicist Robert Spaemann Robert Spaemann (1927–2018), German Catholic philosopher known for work on personhood, Christian ethics, bioethics, ecology and human rights; associated with the Ritter school and…

Romantic friendship: affectionate, non-sexual close relationships Romantic friendship A romantic friendship is an emotionally intense, often physically affectionate but non-sexual bond between friends. This article covers features, history, modern relevance, and how…

Rota Fortunae (Wheel of Fortune): Fate, Symbolism, and Cultural History Rota Fortunae Rota Fortunae—also called the Wheel of Fortune—is the emblem of Fortune's unpredictability from Roman myth through medieval thought, art, tarot and modern culture.

Rules for the Direction of the Mind: Descartes’ Unfinished Method Rules for the Direction of the Mind An overview of René Descartes’ early methodological work Regulae ad directionem ingenii: composition, structure, publication history, and its relation to the Discourse on the Metho…