Practice - Pushdown Automata (PDA): Formal Definition and Recognition of CFLs
Practice Questions
Test your understanding with targeted questions
What does a Pushdown Automaton use for memory?
💡 Hint: Think about the structure of a PDA.
Name one acceptance condition for PDAs.
💡 Hint: Recall how PDAs can accept strings.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What distinguishes a PDAs from DFAs?
💡 Hint: Think about how memory structure changes the capabilities of these automata.
True or False: PDAs can accept non-context-free languages.
💡 Hint: Recall the definition of context-free languages.
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Challenge Problems
Push your limits with advanced challenges
Design a non-deterministic PDA for the language L={a^n b^n | n ≥ 0}. Explain your state transitions.
💡 Hint: Remember the flow from pushing to popping based on the inputs.
Prove that there exists a context-free grammar for the language {a^n b^n | n >= 0}. What are the production rules?
💡 Hint: Construct derivations from the start symbol to involve balanced pairs.
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Reference links
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