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Essay on Realism vs. Antirealism: A comparison of Basic tenets
Realism, in philosophy: In medieval philosophy realism represented a position taken on the problem of universals. There were two schools of realism. Extreme realism, represented by William of Champeaux, held that universals exist independently of both the human mind and particular things—a theory closely associated with that of Plato. Some other philosophers rejected this view for what can be termed moderate realism, which held that universals exist only in the mind of God, as patterns by which he creates particular things. St. Thomas Aquinas and John of Salisbury were proponents of moderate realism. 2. In epistemology realism represents the theory that particular things exist independently of our perception. This position is in direct contrast to the theory of idealism, which holds that reality exists only in the mind. Most contemporary British and American philosophy tends toward realism. (The Columbia Electronic Encyclopedia, 2005)
It is easier to define scientific realism than it is to identify its role as a distinctly philosophical doctrine. Scientific realists hold that the characteristic product of successful scientific research is knowledge of largely theory-independent phenomena and that such knowledge is possible (indeed actual) even in those cases in which the relevant phenomena are not, in any non-question-begging sense, observable. According to scientific realists, for example, if you obtain a good contemporary chemistry textbook you will have good reason to believe (because the scientists whose work the book reports had good scientific evidence for) the (approximate) truth of the claims it contains about the existence and properties of atoms, molecules, sub-atomic particles, energy levels, reaction mechanisms, etc.
Moreover, you have good reason to think that such phenomena have the properties attributed to them in the textbook independently of our theoretical conceptions in chemistry. Scientific realism is thus the common sense (or common science) conception that, subject to a recognition that scientific methods are fallible and that most scientific knowledge is approximate.................
