Designing a PDA for the Language a^n b^n | Theory of Automata & Formal Languages

Struggling to build a Pushdown Automaton for a^n b^n? In this step-by-step problem-solving lesson, we design a PDA that accepts exactly the strings with n a's followed by n b's, the classic non-regular language that PDAs handle with ease. What you'll learn: Why a^n b^n is NOT a regular language and needs a stack How to use the stack to count and match a's against b's Choosing states, transitions, and stack operations (push/pop) Handling acceptance by empty stack vs. acceptance by final state Tracing example strings to verify the design works Subject: Theory of Automata and Formal Languages Video Type: Problem Solving Target Level: Undergraduate Instructor: M. Imran Shafi Full Playlist:    • Design a PDA for a^n b^(2n) | Automata Lec...   Related Video:    • Design a PDA for a^n b^(2n) | Automata Lec...   If this helped you understand PDA design, like the video, subscribe, and continue with the rest of the Theory of Automata playlist for more worked examples. Keywords: Theory of Automata, Formal Languages, Regular Languages, Push Down Automata, a^n b^n