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Sociology of knowledge — The Sociology of Knowledge is the study of the relationship between human thought and the social context within which it arises, and of the effects prevailing ideas have on societies. (Compare history of ideas.)The term first came into widespread … Wikipedia
Knot invariant — In the mathematical field of knot theory, a knot invariant is a quantity (in a broad sense) defined for each knot which is the same for equivalent knots. The equivalence is often given by ambient isotopy but can be given by homeomorphism. Some… … Wikipedia