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In propositional logic, affirming the consequent (also known as converse error, fallacy of the converse, or confusion of necessity and sufficiency) is a formal fallacy (or an invalid form of argument) that is committed when, in the context of an indicative conditional statement, it is stated that because the consequent is true, therefore the ...
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 ...
The Van Gogh Fallacy is an example of a logical fallacy. It is a type of fallacy wherein the conclusion is affirmed by its consequent (fallacy of affirming the consequent) instead of its antecedent (modus ponens). [1] [2] Its name is derived from a particular case that argues:
For example: No fish are dogs, and no dogs can fly, therefore all fish can fly. The only thing that can be properly inferred from these premises is that some things that are not fish cannot fly, provided that dogs exist. Or: We don't read that trash. People who read that trash don't appreciate real literature. Therefore, we appreciate real ...
While a logical argument is a non sequitur if, and only if, it is invalid, the term "non sequitur" typically refers to those types of invalid arguments which do not constitute formal fallacies covered by particular terms (e.g., affirming the consequent). In other words, in practice, "non sequitur" refers to an unnamed formal fallacy.
Negative conclusion from affirmative premises is a syllogistic fallacy committed when a categorical syllogism has a negative conclusion yet both premises are affirmative. The inability of affirmative premises to reach a negative conclusion is usually cited as one of the basic rules of constructing a valid categorical syllogism.
The fallacies Aristotle identifies in Chapter 4 (formal fallacies) and 5 (informal fallacies) of this book are the following: Fallacies in the language or formal fallacies (in dictionem):
Download as PDF; Printable version; In other projects ... This category is for fallacies of propositional logic, ... Argument from fallacy