Formal Languages Questions
A pushdown automaton (PDA) is a type of automaton that extends the capabilities of a finite automaton by incorporating a stack. It consists of a finite set of states, an input alphabet, a stack alphabet, a transition function, an initial state, and one or more final states. The PDA can read input symbols, change states, and manipulate the stack based on the current state and the top symbol of the stack. It is capable of recognizing context-free languages, which are a more powerful class of languages than those recognized by finite automata.