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Contemporary Philosophies. Critical Rationalism (Popper).

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Сritical rationalists hold that scientific theories, and any other claims to knowledge, can and should be rationally criticised, and (if they have empirical content) can and should be subjected to tests which may falsify them. Thus claims to knowledge may be contrastively, normatively evaluated. They are either falsifiable and thus empirical (in a very broad sense), or not falsifiable and thus non-empirical. Those claims to knowledge that are potentially falsifiable can then be admitted to the body of empirical science, and then further differentiated according to whether they are (so far) retained or indeed are actually falsified. If retained, yet further differentiation may be made on the basis of how much subjection to criticism they have received, how severe such criticism has been, and how probable the theory is, with the least probable theory that still withstands attempts to falsify it being the one to be preferred. That it is the least probable theory that is to be preferred is one of the contrasting differences between critical rationalism and classical views on science, such as positivism, who hold that one should instead accept the most probable theory.

"Critical rationalism" is the most distinct shift in positivism, especially as it appears in Karl Popper's philosophy, and it goes far beyond philosophy. Popper did not need to throw off the ballast of "linguistic" analysis; he never had such tendencies. Critical rationalism does not merely temper linguistic philosophy, but rejects it; it even declares opposition to all positivism. Popper claimed that he had been fighting "all forms of positivism" since 1930.

Most criticisms of Popper's philosophy are of the falsification, or error elimination, element in his account of problem solving. In interpreting these, it is important to bear in mind the aims of his idea. It is intended as an ideal, practical method of effective human problem solving; as such, the current conclusions of science are stronger than pseudo-sciences or non-sciences, insofar as they have survived this particularly vigorous selection method. He does not argue that any such conclusions are therefore true, or that this describes the actual methods of any particular scientist.

Critical rationalism rejects the classical position that knowledge is justified true belief; it instead holds the exact opposite: That, in general, knowledge is unjustified untrue unbelief. It is unjustified because of the non-existence of good reasons. It is untrue, because it usually contains errors that sometimes remain unnoticed for hundreds of years. And it is not belief either, because scientific knowledge, or the knowledge needed to build a plane, is contained in no single person's mind. It is only available as the content of books.




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