By downloading "Formal Languages and Automata Theory" by Puntambekar, you'll gain access to a wealth of knowledge on formal languages and automata theory. This book is perfect for:
: Context-Free Grammars (CFG), derivation trees, and ambiguity.
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The book typically covers fundamentals of finite automata, regular expressions, grammar formalisms, context-free grammars (CFG), and computability theory.