Notice that it is possible to have multiple critical rows, and remember that for an argument to be valid, all critical rows must have true conclusions!Ī valid argument for a propositional well formed formula (wff) say P1 P2 P2. While rows 3, 4 and 5 indicate valid (true) premises, the 4th row reveals a false conclusion (indicated by dark blue) therefore, the above argument form is invalid. An invalid argument form can likewise be demonstrated by truth tables. ![]() The critical row is highlighted in blue.Ģ. ![]() ![]() P (q r) and ~p are the premises, while q r is the conclusion. ![]() The validity of the following argument is confirmed by the critical rows of the truth table as shown below.
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