Epistemology, from the Greek words episteme (knowledge) and logos (word/speech) is the branch of philosophy that deals with the nature, origin and scope of knowledge.
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René Descartes (IPA: [rəne.dekɑʁt], March 31, 1596 – February 11, 1650), also known as Cartesius, worked as a philosopher and mathematician. He is equally notable for both his groundbreaking work in philosophy and mathematics. As the inventor of the Cartesian coordinate system, he formulated the basis of modern geometry (analytic geometry), which in turn influenced the development of modern calculus.
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The Latin phrase cogito, ergo sum ("I think, therefore I am") is possibly the single best-known philosophical statement and is attributed to René Descartes. Cogito ergo sum is a translation of Descartes' original French statement, Je pense, donc, je suis.
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Continental Rationalism is a school of philosophy based on the thesis that human reason is the source of knowledge. It originated with René Descartes and spread during the 17th and 18th centuries, primarily in continental Europe. In contrast, its contemporary rival, British Empiricism, held that all knowledge comes to us through experience or through our senses. At issue is the fundamental source of human knowledge, and what the proper techniques are for verifying what we think we know. (See Epistemology.)
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Meditations on First Philosophy (subtitled In which the existence of God and the real distinction of mind and body, are demonstrated), written by René Descartes (1596 - 1650) and first published in 1641, expands upon Descartes' philosophical system, which he first introduced in his Discourse on Method (1637).
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Philosophical skepticism (UK spelling, scepticism) is the philosophical school of thought in which one critically examines whether the knowledge and perceptions one has are true, and whether or not one can ever be said to have true knowledge.
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Rationalism, also known as the rationalist movement, is a philosophical doctrine that asserts that the truth should be determined by reason and factual analysis, rather than faith, dogma or religious teaching.
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A priori is a Latin phrase meaning "from the former" or less literally "before experience". In much of the modern Western tradition, the term a priori is considered to mean propositional knowledge that can be had without, or "prior to", experience. It is usually contrasted with a posteriori knowledge meaning "after experience", which requires experience instead of propositions.
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Empirical or a posteriori knowledge is propositional knowledge obtained by experience. It is contrasted with a priori knowledge, or knowledge that is gained through the apprehension of innate ideas, "intuition," "pure reason," or other non-experiential sources.
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Empiricism (greek εμπειρισμός, from empirical, latin experientia - the experience) is generally regarded as being at the heart of the modern scientific method, that our theories should be based on our observations of the world rather than on intuition or faith; that is, empirical research and a posteriori inductive reasoning rather than purely deductive logic.
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Foundationalism is any theory in epistemology (typically, theories of justification, but also of knowledge) that holds that beliefs are justified (known, etc.) based on what are called basic beliefs (also commonly called foundational beliefs). Basic beliefs are beliefs that give justificatory support to other beliefs, and more derivative beliefs are based on those more basic beliefs. The basic beliefs are said to be self-justifying or self-evident, that is, they are justified, although not justified by other beliefs. Typically and historically, foundationalists have held that basic beliefs are justified by mental events or states, such as experiences, that do not constitute beliefs (these are called nondoxastic mental states).
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Coherentism is belief in the coherence theory of justification — an epistemological theory opposing foundationalism and offering a solution to the regress argument. In this epistemological capacity, it is a theory about how belief can be justified. Coherentism also refers to the coherence theory of truth.
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Reliabilism, a category of theories in the philosophical discipline of epistemology, has been advanced both as a theory of knowledge and of justified belief (as well as other varieties of so-called positive epistemic status).
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The philosophy of perception concerns how mental processes and symbols depend on the world internal and external to the perceiver. Our perception of the external world begins with the senses, which lead us to generate empirical concepts representing the world around us, within a mental framework relating new concepts to preexisting ones. Because perception leads to an individual's impression of the world, its study may be important for those interested in better understanding communication, self, id, ego —even reality.
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In philosophy naive realism is used to describe the belief that physical objects continue to exist when they are no longer perceived. It can be contrasted with solipsism.
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Solipsism (from the Latin ipse = "self" and solus = "alone") is the metaphysical belief that only oneself exists, and that "existence" just means being a part of one's own mental states — all objects, people, etc, that one experiences are merely parts of one's own mind.
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Representationalism, or the representational theory of perception, is a philosophical doctrine that in any act of perception, the immediate (direct) object of perception is a sense-datum that represents an external object, which is the mediate (indirect) object of perception.
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Representative Realism is a philosophical concept, largely developed by Bertrand Russell. It does, unlike naïve realism, take into account sense data (the way in which the object is interpreted, not simply the objective, mathematical object) - this induces the veil of perception wherein we are unsure the table we look at exists due to there being no objective proof of its existence.
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In philosophy, idealism is any theory positing the primacy of spirit, mind, or language over matter. It includes claiming that thought has some crucial role in making the world the way it is--that thought and the world are made for one another, or that they make one another.
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Transcendental idealism, also called formalistic idealism, is a doctrine founded by 18th-century German philosopher Immanuel Kant and influential in much subsequent German Philosophy.
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Subjective idealism is a theory in the philosophy of perception. It describes a relationship between human experience of the external world, and that world itself, in which objects are nothing more than collections (or bundles) of sense data in those who perceive them.
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In the philosophy of perception, phenomenalism is the view that physical objects, properties, events (whatever is physical) are reducible to mental objects, properties, events. Ultimately, only mental objects, properties, events, exist. In particular, we may reduce talk of physical bodies to talk of bundles of sense-data.
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The philosophical concept of causality or causation refers to the set of all particular "causal" or "cause-and-effect" relations.
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The Gettier problem is a fundamental problem in contemporary epistemology (the philosophy of knowledge), issuing from counterexamples to the definition of knowledge as justified true belief.
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