Search results
Results from the WOW.Com Content Network
This category is for fallacies of propositional logic, which deals with the logical relationships between propositions Pages in category "Propositional fallacies ...
Logical Fallacies, Literacy Education Online; Informal Fallacies, Texas State University page on informal fallacies; Stephen's Guide to the Logical Fallacies (mirror) Visualization: Rhetological Fallacies, Information is Beautiful; Master List of Logical Fallacies, University of Texas at El Paso; Fallacies, Internet Encyclopedia of Philosophy
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 ...
The following is a list of some common valid argument forms in propositional logic. It is nowhere near exhaustive, and gives only a few examples of the better known valid argument forms. Modus ponens
For example, John might be going to work on Wednesday. In this case, the reasoning for John's going to work (because it is Wednesday) is unsound. The argument is only sound on Tuesdays (when John goes to work), but valid on every day of the week. A propositional argument using modus ponens is said to be deductive.
It is an attempt to prove a proposition while simultaneously taking the proposition for granted. When the fallacy involves only a single variable, it is sometimes called a hysteron proteron [14] [15] [16] (Greek for ' later earlier '), a rhetorical device, as in the statement: Opium induces sleep because it has a soporific quality. [17]
An example of a language dependent fallacy is given as a debate as to who in humanity are learners: the wise or the ignorant. [18]: 3 A language-independent fallacy is, for example: "Coriscus is different from Socrates." "Socrates is a man." "Therefore, Coriscus is different from a man." [18]: 4
A second example provides a first proposition that appears realistic and shows how an obviously flawed conclusion still arises under this fallacy. [3] To be on the cover of Vogue Magazine, one must be a celebrity or very beautiful. This month's cover was a celebrity. Therefore, this celebrity is not very beautiful.