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A formal fallacy, deductive fallacy, logical fallacy or non sequitur (Latin for "it does not follow") is a flaw in the structure of a deductive argument that renders the argument invalid. The flaw can be expressed in the standard system of logic. [1] Such an argument is always considered to be wrong.
Syllogistic fallacies – logical fallacies that occur in syllogisms. Affirmative conclusion from a negative premise (illicit negative) – a categorical syllogism has a positive conclusion, but at least one negative premise. [11] Fallacy of exclusive premises – a categorical syllogism that is invalid because both of its premises are negative ...
Begging the question is not considered a formal fallacy (an argument that is defective because it uses an incorrect deductive step). Rather, it is a type of informal fallacy that is logically valid but unpersuasive, in that it fails to prove anything other than what is already assumed. [23] [24] [25]
An argument from authority [a] is a form of argument in which the opinion of an authority figure (or figures) is used as evidence to support an argument. [1]The argument from authority is a logical fallacy, [2] and obtaining knowledge in this way is fallible.
Logical fallacy: Since most of the green is touching red, and most of the red is touching blue, most of the green must be touching blue. This, however, is a false statement. In the strictest sense, a logical fallacy is the incorrect application of a valid logical principle or an application of a nonexistent principle: Most Rimnars are Jornars.
From a logical and argumentative point of view, whataboutism is considered a variant of the tu-quoque pattern (Latin 'you too', term for a counter-accusation), which is a subtype of the ad-hominem argument.
Fallacy: Loaded Questions and Complex Claims Critical Thinking exercises. San Jose State University. Logical Fallacy: Loaded Question Archived 2020-12-11 at the Wayback Machine The Fallacy Files; What Is The Loaded Question Fallacy? Definition and Examples Archived 2021-05-11 at the Wayback Machine Fallacy in Logic
Argument from fallacy is the formal fallacy of analyzing an argument and inferring that, since it contains a fallacy, its conclusion must be false. [1] It is also called argument to logic ( argumentum ad logicam ), the fallacy fallacy , [ 2 ] the fallacist's fallacy , [ 3 ] and the bad reasons fallacy .