We have already seen examples showing that some modal derivations have natural justification counterparts: Examples 2.10-2.21. These are really instances of a very general phenomenon that we call realization.
That is, for many common modal logics, each of their theorems can be read as a statement about explicit justifications, which can be found by an algorithmic procedure. In this chapter we present the original Realization Theorem and its proof, for S4 and its subsystems.
6.1
More on the topic We have already seen examples showing that some modal derivations have natural justification counterparts: Examples 2.10-2.21. These are really instances of a very general phenomenon that we call realization.:
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