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A fallacy is the use of invalid or otherwise faulty reasoning in the construction of an argument [1] [2] that may appear to be well-reasoned if unnoticed. The term was introduced in the Western intellectual tradition by the Aristotelian De Sophisticis Elenchis. [3]
Definitional retreat – changing the meaning of a word when an objection is raised. [23] Often paired with moving the goalposts (see below), as when an argument is challenged using a common definition of a term in the argument, and the arguer presents a different definition of the term and thereby demands different evidence to debunk the argument.
In logic and philosophy, a formal fallacy [a] is a pattern of reasoning rendered invalid by a flaw in its logical structure. Propositional logic, [2] for example, is concerned with the meanings of sentences and the relationships between them. It focuses on the role of logical operators, called propositional connectives, in determining whether a ...
Logic is the formal science of using reason and is considered a branch of both philosophy and mathematics and to a lesser extent computer science.Logic investigates and classifies the structure of statements and arguments, both through the study of formal systems of inference and the study of arguments in natural language.
Fallacies of definition are the various ways in which definitions can fail to explain terms. The phrase is used to suggest an analogy with an informal fallacy. [1] Definitions may fail to have merit, because they are overly broad, [2] [3] [4] overly narrow, [3] [4] or incomprehensible; [4] or they use obscure or ambiguous language, [2] contain mutually exclusive parts, [3] or (perhaps most ...
Precambrian rabbit – Evolutionary biology hypothetical posed by J. B. S. Haldane; Raven paradox – Paradox arising from the question of what constitutes evidence for a statement; Russell's teapot – Analogy devised by Bertrand Russell; Scientific method – Interplay between observation, experiment, and theory in science
When the fallacy of begging the question is committed in more than one step, some authors dub it circulus in probando ' reasoning in a circle ', [14] [22] or more commonly, circular reasoning. Begging the question is not considered a formal fallacy (an argument that is defective because it uses an incorrect deductive step ).
The genetic fallacy (also known as the fallacy of origins or fallacy of virtue) [1] is a fallacy of irrelevance in which arguments or information are dismissed or validated based solely on their source of origin rather than their content.