Module
Pushdown Automata and CFG–PDA Equivalence
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About
PDAs: stack, transitions, acceptance by empty stack or final state. Deterministic vs. nondeterministic PDAs. Equivalence of CFGs and PDAs (constructions both ways). Relationship of DCFLs to parsing.
Goal
Design PDAs for classic CFLs; convert a CFG to an equivalent PDA and a PDA to an equivalent CFG; explain why the stack gives precisely context-free power; contrast with DFAs.
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