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In philosophy, a formal fallacy or a logical fallacy is a pattern of reasoning which is always wrong. This article is about Philosophical logic not Philosophy of logic Philosophical logic is the study of the more specifically philosophical aspects of This is due to a flaw in the structure of the argument which renders the argument invalid. In Logic, an argument is a Set of one or more Declarative sentences (or "propositions") known as the Premises along The term validity (also called logical truth, analytic truth, or necessary truth) as it occurs in Logic refers generally to a property of A formal fallacy is contrasted with an informal fallacy, which may have a valid logical form, but be false due to the characteristics of its premises, or its justification structure. An Informal fallacy is an argument whose stated premises fail to support their proposed conclusion In Discourse and Logic, a premise is a claim that is a reason (or element of a set of reasons for or objection against some other claim

The term fallacy is often used more generally to mean an argument which is problematic for any reason, whether it be a formal or an informal fallacy. A fallacy is a component of an Argument which being demonstrably flawed in its Logic or form renders the argument invalid in whole

The presence of a formal fallacy in a deductive argument does not imply anything about the argument's premises or its conclusion. Both may actually be true, or even more probable as a result of the argument (e. g. appeal to authority), but the deductive argument is still invalid because the conclusion does not follow from the premises in the manner described. An appeal to authority or argument by authority is a type of argument in Logic called a fallacy By extension, an argument can contain a formal fallacy even if the argument is not a deductive one; for instance an inductive argument that incorrectly applies principles of probability or causality can be said to commit a formal fallacy. Probability is the likelihood or chance that something is the case or will happen Causality (but not causation) denotes a necessary relationship between one event (called cause and another event (called effect) which is the direct consequence

Recognizing fallacies in everyday arguments may be difficult since arguments are often embedded in rhetorical patterns that obscure the logical connections between statements. Rhetoric has had many definitions no simple definition can do it justice Informal fallacies may also exploit the emotions or intellectual or psychological weaknesses of the audience. An emotion is a mental and physiological state associated with a wide variety of feelings thoughts and behaviours Psychology (from Greek grc ψῡχή psȳkhē, "breath life soul" and grc -λογία -logia) is an Academic and Having the capability to recognize fallacies in arguments is one way to reduce the likelihood of such occurrences.

A different approach to understanding and classifying fallacies is provided by argumentation theory. Argumentation theory, or argumentation, embraces the arts and sciences of civil debate Dialogue, conversation and persuasion studying rules of Inference In this approach, an argument is regarded as an interactive protocol between individuals which attempts to resolve their disagreements. In International politics, protocol is the Etiquette of Diplomacy and affairs of state The protocol is regulated by certain rules of interaction and violations of these rules are fallacies. Many of the fallacies in the list below are best understood as being fallacies in this sense.

Such fallacies are used in many forms of modern communications where the intention is to influence behavior and change beliefs - examples in the mass media today include but are not limited to propaganda, advertisements, politics, newspaper editorials and opinion-based news shows. "Popular press" redirects here note that the University of Wisconsin Press publishes under the imprint "The Popular Press" Propaganda is a concerted set of messages aimed at influencing the opinions or behaviors of large numbers of people Advertising is a form of Communication that typically attempts to persuade potential Customers to Purchase or to consume more of a particular Brand Politics Politics is the process by which groups of people make decisions

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Common examples

Main article: List of fallacies

For a list of types of formal and informal fallacy, as well as examples of fallacious arguments, see Fallacy. This is a list of logical fallacies. Formal fallacies Formal fallacies are arguments that are fallacious due to an error in their form or technical A fallacy is a component of an Argument which being demonstrably flawed in its Logic or form renders the argument invalid in whole For a concise list of "appeal to" fallacies, see Appeal (disambiguation).

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Dictionary

formal fallacy

-noun

  1. (logic) A pattern of reasoning which is always wrong, due to a flaw in the structure of the argument.
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