Push Down Automata:
The PDA is used in theories regarding what can be estimated by machines. It is more capable in compare of a finite-state machine but less capable in compare of a Turing machine. Since its input can be described with a formal grammar, it can be utilized in parser design. The deterministic pushdown automaton can deal along with all of the deterministic context-free languages whereas the nondeterministic version can handle all context-free languages.
PDA as a state diagram:
A PDA is formally described as a 7-tuple:
(Q, ∑, Δ, δ, q0, Z0, F)
Where,
Q refer a finite set of states∑ refer a finite set which is called the input alphabetΔ refer a finite set which is called the stack alphabetδ refer a finite subset of , the transition relation.q0 refer the start stateZ0 refer the initial stack symbolF refer the set of accepting states
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