Tableaux'method for intuitionistic logic through S4-translation
(p=>q)+(q=>p)
The formula ((p => q) + (q => p)) is not valid Formula's counter-model Number of states = 3 Initial state = 1 The accessibility relation is the reflexive and transitive closure of the following relation : 1 -> 2 , 3 No variable is true in state 1 The true variables in state 2 are : q The true variables in state 3 are : p
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basis of the method (in french)
Last Modified : 17-Dec-2021