formal fallacy in a sentence

Examples

1. A formal fallacy can be expressed neatly in a standard system of logic, such as propositional logic, Arguments containing informal fallacies may be formally valid, but still fallacious.
2. Begging the question is not considered a formal fallacy ( an argument that is defective because it uses an incorrect logically valid but unpersuasive, in that it fails to prove anything other than what is already assumed.
3. Seems to me that you're dealing ( hypothetically, I hope ) with a difference of axioms, rather than a formal fallacy .  talk ) 06 : 13, 21 July 2012 ( UTC)
4. By extension, an argument can contain a formal fallacy even if the argument is not a deductive one; for instance an inductive argument that incorrectly applies principles of probability or causality can be said to commit a formal fallacy.
5. By extension, an argument can contain a formal fallacy even if the argument is not a deductive one; for instance an inductive argument that incorrectly applies principles of probability or causality can be said to commit a formal fallacy.
6. By extension, an argument can contain a formal fallacy even if the argument is not a deductive one : for instance, an inductive argument that incorrectly applies principles of probability or causality can be said to commit a formal fallacy.
7. By extension, an argument can contain a formal fallacy even if the argument is not a deductive one : for instance, an inductive argument that incorrectly applies principles of probability or causality can be said to commit a formal fallacy.
8. :: That's what I thought, but the intro to fallacy of four terms says that this is " the formal fallacy that occurs when a syllogism has four ( or more ) terms rather than the requisite three ".
9. The forms of argument that render deductions valid are well-established, however some invalid arguments can also be persuasive depending on their construction ( inductive arguments, for example ) . " ( See also, formal fallacy and informal fallacy ) ."
10. 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: