Accepted Language & Decided Language
A TM accepts a language if it enters into a final state for any input…
Theory of Computation
Theory of Computation
Pushdown Automata & Parsing
Parsing is used to derive a string using the production rules of a grammar. It…
Theory of Computation
Turing Machine
A Turing Machine is an accepting device which accepts the languages (recursively enumerable set) generated…
Theory of Computation
Pumping Lemma for CFG
Lemma If L is a context-free language, there is a pumping length p such that any string w ∈ L of length ≥ p can…
Theory of Computation
CFG Simplification
In a CFG, it may happen that all the production rules and symbols are not…
Theory of Computation
CFL Closure Property
Context-free languages are closed under − UnionConcatenationKleene Star operation Union Let L1 and L2 be two context free languages.…
Theory of Computation
Difference between Pushdown Automata and Finite Automata
Pushdown Automata:A Pushdown automata (PDA) is a finite state machine with an added stack storage.…
Theory of Computation
Pushdown Automata Acceptance by Final State
We have discussed Pushdown Automata (PDA) and its acceptance by empty stack article. Now, in this article,…