A TM accepts a language if it enters into a final state for any input…

Parsing is used to derive a string using the production rules of a grammar. It…

A Turing Machine is an accepting device which accepts the languages (recursively enumerable set) generated…

Lemma If L is a context-free language, there is a pumping length p such that any string w ∈ L of length ≥ p can…

In a CFG, it may happen that all the production rules and symbols are not…

Context-free languages are closed under − UnionConcatenationKleene Star operation Union Let L1 and L2 be two context free languages.…

Pushdown Automata:A Pushdown automata (PDA) is a finite state machine with an added stack storage.…

We have discussed Pushdown Automata (PDA) and its acceptance by empty stack article. Now, in this article,…