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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.
Argumentum ad populum is a type of informal fallacy, [1] [14] specifically a fallacy of relevance, [15] [16] and is similar to an argument from authority (argumentum ad verecundiam). [ 14 ] [ 4 ] [ 9 ] It uses an appeal to the beliefs, tastes, or values of a group of people, [ 12 ] stating that because a certain opinion or attitude is held by a ...
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 ...
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 fallacy is categorized as a fallacy of inconsistency. [1] Colloquially, a false equivalence is often called "comparing apples and oranges."
Logical Fallacies, Literacy Education Online; Informal Fallacies, Texas State University page on informal fallacies; Stephen's Guide to the Logical Fallacies (mirror) Visualization: Rhetological Fallacies, Information is Beautiful; Master List of Logical Fallacies, University of Texas at El Paso; Fallacies, Internet Encyclopedia of Philosophy
The fallacy lies in concluding that one disjunct must be false because the other disjunct is true; in fact they may both be true because "or" is defined inclusively rather than exclusively. It is a fallacy of equivocation between the operations OR and XOR .
A straw man fallacy (sometimes written as strawman) is the informal fallacy of refuting an argument different from the one actually under discussion, while not recognizing or acknowledging the distinction. [1] One who engages in this fallacy is said to be "attacking a straw man".
The result of conflating concepts may give rise to fallacies and ambiguity, including the fallacy of four terms in a categorical syllogism.For example, the word "bat" has at least two distinct meanings: a flying animal, and a piece of sporting equipment (such as a baseball bat or cricket bat).