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Questions about state machines with a single stack for memory. They characterize the class of context-free languages.

9 votes
3 answers
4k views

Demonstrate that DPDA is closed under complement by construction

I've been trying for quite some extended time to find a construction so that I can formally demonstrate that a deterministic PDA is closed under complementation. However, it happens that every idea I …
PALEN's user avatar
  • 337
5 votes

Demonstrate that DPDA is closed under complement by construction

I didn't have time to write this before but I found an answer. Here is what I did: Let $O$ be the original $PDA$. We will construct a new $PDA$, call it $M$ ($M$ stands for modified). To find the co …
PALEN's user avatar
  • 337