1 Circulation (fluid dynamics), the path integral of the fluid velocity around a closed curve. 2  Circulation (journal), a journal published by the American Heart Association.  Atmospheric circulation, the large-scale movement of air.
An informal fallacy is an argument whose stated premises fail to support their proposed conclusion. Informal fallacies often come about because of an error in reasoning. The premises are then erroneously linked to the conclusion. In contrast to a formal fallacy, the error has to do with issues of inference because language is used to state the propositions; natural language allows to say more than the symbolism of formal logic can represent.
From a psychological point of view, a fallacy is often defined as a mistake in reasoning used for deceptive purposes; however, many fallacies are, in fact, not deceptive to most persons. Even so, many of the informal fallacies are often used in the manipulation of opinion. Many of these mistakes in reasoning occur so often they deserve special study. This section investigates informal fallaciesâthose dependent upon language. An informal fallacy is one that arises from the content of an argument (the meaning what is said, not the grammar in terms of how the argument is expressed).