July 8, 2012
Denying the antecedent: a fallacious conditional argument: if you’re drinking beer, you must be over 21. You are not drinking beer, therefore you must not be over 21. (no one said that you MUST drink beer if you are over 21).

Definitional Matters, Denying the Antecedent
September 5, 2011
A simple interactive truth table for proving the validity of Hypothetical Syllogism

August 31, 2011
A simple interactive truth table for conjunction. Click ‘start’, then click on the atomic components ‘P’ and ‘Q’ on the left to drag their truth-values to the ‘P’ and ‘Q’ in the proposition ‘P iff Q.’ You’ll then be …

August 31, 2011
A simple interactive truth table for conjunction. Click ‘start’, then click on the atomic components ‘P’ and ‘Q’ on the left to drag their truth-values to the ‘P’ and ‘Q’ in the proposition ‘if P then Q.’ You’ll then …

August 12, 2011
A simple interactive truth table for proving the validity of Affirming the Consequent

August 12, 2011
A simple interactive truth table for proving the validity of Denying The Antecedent

August 12, 2011
A simple interactive truth table for proving the validity of Modus Ponens

August 12, 2011
A simple interactive truth table for proving the validity of Modus Tollens

April 21, 2011
A simple flash app to demonstrate the form of hypothetical syllogism.

April 21, 2011
Two simple flash apps to demonstrate the form of disjunctive syllogism