The formal fallacy of affirming a disjunct also known as the fallacy of the alternative disjunct or a false exclusionary disjunct occurs when a deductive argument takes the following logical form:[1]
A or B
A
Therefore, not B
Or in logical operators:
¬
Where denotes a logical assertion.
^Sinnott-Armstrong, Walter; Simmons, Claire (2021-12-15). "Some common fallacies in arguments from M/EEG data". NeuroImage. 245: 118725. doi:10.1016/j.neuroimage.2021.118725. ISSN 1095-9572. PMID 34813968.
and 28 Related for: Affirming a disjunct information
formal fallacy of affirmingadisjunct also known as the fallacy of the alternative disjunct or a false exclusionary disjunct occurs when a deductive argument...
still a fallacy even if the conclusion is true. Affirmingadisjunct is a fallacy when in the following form: A or B is true. B is true. Therefore, A is...
valid and two are invalid. Affirming the antecedent (modus ponens) and denying the consequent (modus tollens) are valid. Affirming the consequent and denying...
be "A xor B xor C" when "A and B and C" or "A and B and not C" (etc.) are not taken into consideration; i.e. the "or" is not exclusive. Affirminga disjunct –...
fallacies: Affirmingadisjunct – concluding that one disjunct of a logical disjunction must be false because the other disjunct is true; A or B; A, therefore...
the distinction. Wikiquote has quotations related to False equivalence. Affirming the consequent Apophenia Equivocation False balance False analogy List...
actually exist. The name comes from a metaphor about a person from Texas who fires a gun at the side of a barn, then paints a shooting target centered on the...
assume there is a perfect solution to a particular problem. A closely related concept is the "perfect solution fallacy". By creating a false dichotomy...
same as the advantages of theft over honest toil". Philosophy portal Affirming the consequent Argument from authority Catch-22 (logic) Circular definition...
B is Z," which is ignored in the argument. The fallacy is similar to affirming the consequent and denying the antecedent. However, the fallacy may be...
be confused with the 'Affirming the consequent', as in "If A, then B. B. Therefore A". One example would be: "Every unicorn has a horn on its forehead"...
McNamara, the US Secretary of Defense from 1961 to 1968, involves making a decision based solely on quantitative observations (or metrics) and ignoring...
purity is an informal fallacy in which one attempts to protect an a posteriori claim from a falsifying counterexample by covertly modifying the initial claim...
a concept called mathematical fallacy. There is a distinction between a simple mistake and a mathematical fallacy in a proof, in that a mistake in a proof...
of some part of the whole. A trivial example might be: "This tire is made of rubber; therefore, the vehicle of which it is a part is also made of rubber...
for the middle solution or for a compromise is always fallacious, but rather applies primarily in cases where such a position is ill-informed, unfeasible...
ignorance represents "a lack of contrary evidence"), is a fallacy in informal logic. The fallacy is committed when one asserts that a proposition is true...
Apophenia – Tendency to perceive connections between unrelated things Affirming the consequent – Type of fallacious argument (logical fallacy) Association...
a strong bias against ideas from the outside. The reasons for not wanting to use the work of others are varied, but can include a desire to support a...
resulting from the use of a particular word/expression in multiple senses within an argument. It is a type of ambiguity that stems from a phrase having two or...
Person A is a hypocrite because Person A once committed this same action. Person B has argued that because Person A is a hypocrite, he does not have a right...
beginning. The form is taken without regard to the content of the language.] Affirming the consequent Modus ponens Modus tollens Necessity and sufficiency Plausible...
A straw man fallacy (sometimes written as strawman) is the informal fallacy of refuting an argument different from the one actually under discussion,...
committed when one makes an appeal to force to bring about the acceptance of a conclusion. One participates in argumentum ad baculum when one emphasizes...
populum (Latin for "appeal to the people") is a fallacious argument which is based on claiming a truth or affirming something is good because many people think...
Therefore, Ginger is a cat. Bob: You have just fallaciously affirmed the consequent. You are incorrect. Therefore, Ginger is not a cat. Alice: I speak...
An appeal to nature is a rhetorical technique for presenting and proposing the argument that "a thing is good because it is 'natural', or bad because it...
antiquitam, appeal to antiquity, or appeal to common practice) is a claim in which a thesis is deemed correct on the basis of correlation with past or...
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