Logical Fallacies

I found this page via a post on Richard Dawkins Forum: http://www.richarddawkins.net/forum/viewtopic.php?f=4&t=51836

Source: http://www.safalra.com/philosophy/fallacies/

Welcome to the Logical Fallacies section of Safalra's Website. This section of contains the following pages:

• Affirming The Consequent

  The fallacy of using an argument of the form 'if A then B, B, therefore A'

• Denying The Antecedent

  The fallacy of using an argument of the form 'if A then B, not A, therefore not B'

• False Dilemma

  The fallacy of asserting the truth of the statement 'A or B' when in fact both may be false

• Four Terms

  The fallacy of using four terms in a categorical syllogism

• Negative Proof

  The fallacy of using an argument of the form 'P has not been observed, therefore P does not exist' about a phenomenon P

• Perfect Solution

  The fallacy of using an argument of the form 'proposed solution S does not fully solve problem P, therefore S should not be implemented'

The following four pages are based on work by Stephen Downes, and as such may be used in any way you wish provided you do not claim copyright over it, do not charge for it, and indicate the original authorship - Stephen Downes and Safalra (Stephen Morley).

• The Argument From Ignorance

  The fallacy of assuming something is false if not proven to be true

• The Complex Question

  The fallacy of treating two separate propositions as a single proposition

• The Slippery Slope

  The fallacy of deriving a series of increasingly unacceptable consequences