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| Resource | Type | Cost | |----------|------|------| | Introduction to the Theory of Computation (Michael Sipser) – older editions | Textbook | ~$10–20 used | | Automata Theory (free online) by Ullman & Hopcroft (Stanford lecture notes) | Web / PDF | Free | | NPTEL video course on Theory of Computation (IIT professors) | Video + transcripts | Free | | OSSU – Theory of Computation (Open Source Society University) | Curated free readings | Free |
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