![]() Fallacy of exclusive premises – a categorical syllogism that is invalid because both of its premises are negative.Affirmative conclusion from a negative premise (illicit negative) – a categorical syllogism has a positive conclusion, but at least one negative premise.Syllogistic fallacies – logical fallacies that occur in syllogisms. Existential fallacy – an argument that has a universal premise and a particular conclusion.Ī quantification fallacy is an error in logic where the quantifiers of the premises are in contradiction to the quantifier of the conclusion. ![]() Denying the antecedent – the consequent in an indicative conditional is claimed to be false because the antecedent is false if A, then B not A, therefore not B.Affirming the consequent – the antecedent in an indicative conditional is claimed to be true because the consequent is true if A, then B B, therefore A.Affirming a disjunct – concluding that one disjunct of a logical disjunction must be false because the other disjunct is true A or B A, therefore not B.The following fallacies involve relations whose truth values are not guaranteed and therefore not guaranteed to yield true conclusions. For a compound proposition to be true, the truth values of its constituent parts must satisfy the relevant logical connectives that occur in it (most commonly:, ,, , ). ![]() Ī propositional fallacy is an error that concerns compound propositions.
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