Question: We know that deterministic PDA (DPDA) are not equivalently expressive as nondeterminis- tic PDA (NPDA). Also, we know that both DPDA and NPDA have only

We know that deterministic PDA (DPDA) are not equivalently expressive as

We know that deterministic PDA (DPDA) are not equivalently expressive as nondeterminis- tic PDA (NPDA). Also, we know that both DPDA and NPDA have only one stack. Suppose we allow a deterministic 2-stack DPDA. Prove or disprove the following statements about the set of languages decided by each of the automata: automata to read and write from two stacks concurrently, call this a a) DPDA C 2-stack DPDA b) 2-stack DPDA C DPDA e) NPDA C 2-stack DPDA d) 2-stack DPDA C NPDA

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