Archive for Conditional reasoning

Denying The Antecedent

July 8, 2012 No Comments

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
Truth Table for Hypothetical Syllogism

Truth Table for Hypothetical Syllogism

September 5, 2011 No Comments

A simple interactive truth table for proving the validity of Hypothetical Syllogism

Simple Truth Table – Biconditional

Simple Truth Table – Biconditional

August 31, 2011 No Comments

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 …

Simple Truth Table – Conditional

Simple Truth Table – Conditional

August 31, 2011 No Comments

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 …

Truth Table for Affirming the Consequent

Truth Table for Affirming the Consequent

August 12, 2011 No Comments

A simple interactive truth table for proving the validity of Affirming the Consequent

Truth Table for Denying the Antecedent

Truth Table for Denying the Antecedent

August 12, 2011 No Comments

A simple interactive truth table for proving the validity of Denying The Antecedent

Truth Table for Modus Ponens

Truth Table for Modus Ponens

August 12, 2011 No Comments

A simple interactive truth table for proving the validity of Modus Ponens

Truth Table for Modus Tollens

Truth Table for Modus Tollens

August 12, 2011 No Comments

A simple interactive truth table for proving the validity of Modus Tollens

Hypothetical Syllogism Form

Hypothetical Syllogism Form

April 21, 2011 No Comments

A simple flash app to demonstrate the form of hypothetical syllogism.

Disjunctive Syllogism Form

Disjunctive Syllogism Form

April 21, 2011 No Comments

Two simple flash apps to demonstrate the form of disjunctive syllogism

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Fake Expert

Fake Expert: A fallacious appeal to authority in which the 'expert' is not an expert at all.

Expert in the wrong domain

Expert in the wrong domain: a fallacious version of an appeal to authority - i.e. appealing to a doctor...

Slippery Slope

Slippery slope: If we take one step, we’ll have to take all the rest of them because there’s no...

Post Hoc Ergo Propter Hoc

Post hoc ergo propter hoc: “After this, therefore because of this”, a fallacy in reasoning about causes. (I took...

Poisoning The Well

Poisoning the well: Telling the audience what to think of a speaker when you’re introducing the speaker (My next...