Semantic Tableaux Methods for Modal Logics That Include the B(rowerische) and G(each) Axioms

Francis Jeffry Pelletier

There are various different formats for stating the method of semantic tableaux. The method Fitting uses is quite similar to the method I wish to employ, and there should be no difficulty in transforming the one into the other. In this note, I am interested in extending my method to a certain class of modal logics. In this extension we will only consider propositional logics - a fact that lends some considerable simplification to the description of the tableaux method.

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