Logical Fallacies

Logical Fallacies / Syllogistic Fallacies

Syllogistic Fallacies

When logical fallacies occur in the syllogisms of deductive reasoning. This occurs with a reference to something general, and then makes a conclusion about something more specific.

Definition of a categorical syllogism is an argument with two premises: one syllogism and one conclusion.

  • A: All S are P. (Ex. All dogs are mammals.)
  • E: No S are P. (Ex. No cats are fish.)
  • I: Some S are P. (Some logicians are philosophers.)
  • O: Some S are not P. (Some men are not clowns.)

Example of Syllogistic Fallacies

All sharks are fish (All S are P.) All salmon are fish ( All x are P) Therefore all salmon are sharks. (All x are P.)

Alternative Name: Fallacy of the Undistributed Middle