Grammar construction - PowerPoint PPT Presentation

PDAs Accept Context-Free Languages

PDAs Accept Context-Free Languages. Theorem:. Context-Free Languages (Grammars). Languages Accepted by PDAs. Proof - Step 1:. Context-Free Languages (Grammars). Languages Accepted by PDAs. Convert any context-free grammar to a PDA with: . Proof - Step 2:.

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Converting NPDAs to Context-Free Grammars

Converting NPDAs to Context-Free Grammars. For any NPDA. we will construct a context-free grammar with. Intuition:. The grammar simulates the machine. A derivation in Grammar :. Current configuration in NPDA. A derivation in Grammar :. terminals. variables.

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