doc-src/TutorialI/CTL/PDL.thy
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     1 (*<*)theory PDL = Base:(*>*)
     1 (*<*)theory PDL imports Base begin(*>*)
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     2 
     3 subsection{*Propositional Dynamic Logic --- PDL*}
     3 subsection{*Propositional Dynamic Logic --- PDL*}
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     4 
     5 text{*\index{PDL|(}
     5 text{*\index{PDL|(}
     6 The formulae of PDL are built up from atomic propositions via
     6 The formulae of PDL are built up from atomic propositions via