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Equivocation in a syllogism (a chain of reasoning) produces a fallacy of four terms (quaternio terminorum). Below is an example: Since only man [human] is rational. And no woman is a man [male]. Therefore, no woman is rational. [1] The first instance of "man" implies the entire human species, while the second implies just those who are male.
Mental reservation (or mental equivocation) is an ethical theory and a doctrine in moral theology which recognizes the "lie of necessity", and holds that when there is a conflict between justice and telling the truth, it is justice that should prevail.
In everyday reasoning, the fallacy of four terms occurs most frequently by equivocation: using the same word or phrase but with a different meaning each time, creating a fourth term even though only three distinct words are used. The resulting argument sounds like the (valid) first example above, but is in fact structured like the invalid ...
Traditionally, a great number of informal fallacies have been identified, including the fallacy of equivocation, the fallacy of amphiboly, the fallacies of composition and division, the false dilemma, the fallacy of begging the question, the ad hominem fallacy and the appeal to ignorance. There is no general agreement as to how the various ...
In turn, material fallacies may be placed into the more general category of informal fallacies. Verbal fallacies may be placed in either formal or informal classifications: Compare equivocation, which is a word- or phrase-based ambiguity, to the fallacy of composition, which is premise- and inference-based ambiguity. [17]
Equivocation – using a term with more than one meaning in a statement without specifying which meaning is intended. [21] Ambiguous middle term – using a middle term with multiple meanings. [22] Definitional retreat – changing the meaning of a word when an objection is raised. [23]
Apples and oranges are both similar-sized seeded fruits that grow on trees, but that does not make the two interchangeable. A false equivalence or false equivalency is an informal fallacy in which an equivalence is drawn between two subjects based on flawed or false reasoning.
This inference is unsound because all cats, by definition, are mammals. A second example provides a first proposition that appears realistic and shows how an obviously flawed conclusion still arises under this fallacy. [3] To be on the cover of Vogue Magazine, one must be a celebrity or very beautiful. This month's cover was a celebrity.