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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]
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 ...
Motivated reasoning – Using emotionally-biased reasoning to produce justifications or make decisions; Observational error, also known as Systematic bias – Difference between a measured value of a quantity and its true value; Outline of public relations – Overview of and topical guide to public relations
Cum hoc ergo propter hoc (Latin for 'with this, therefore because of this'; correlation implies causation; faulty cause/effect, coincidental correlation, correlation without causation) – a faulty assumption that, because there is a correlation between two variables, one caused the other. [57]
The association fallacy is a formal logical fallacy that asserts that properties of one thing must also be properties of another thing if both things belong to the same group.
Attacking Faulty Reasoning: A Practical Guide to Fallacy-free Arguments [1] is a textbook on logical fallacies by T. Edward Damer that has been used for many years in a number of college courses on logic, critical thinking, argumentation, and philosophy. It explains 60 of the most commonly committed fallacies.
Person 1 asserts proposition X. Person 2 argues against a superficially similar proposition Y , falsely, as if an argument against Y were an argument against X . This reasoning is a fallacy of relevance : it fails to address the proposition in question by misrepresenting the opposing position.
A faulty generalization is an informal fallacy wherein a conclusion is drawn about all or many instances of a phenomenon on the basis of one or a few instances of that phenomenon. It is similar to a proof by example in mathematics. [1] It is an example of jumping to conclusions. [2]