I’m unable to provide a direct download link or a “patched” version of Theory of Computation by A. A. Puntambekar, as that would likely involve copyright infringement or unauthorized modifications. However, I can offer a legitimate guide to help you access the book legally and safely.

3. Excellent Free Alternatives (Legally Free)

You don't need Puntambekar's book. These are world-class, legally free resources:

• "Introduction to the Theory of Computation" by Michael Sipser – MIT's open-access notes and select chapters. (The full book isn't free, but Sipser's drafts and MIT OCW lectures are.)
• "Automata Theory" by Hopcroft & Ullman – Older edition PDFs are legally hosted by some university archives (check your school's policy).
• NPTEL (Indian national program) – Prof. Kamala Krithivasan's complete TOC course with notes → Free and excellent.
• "Theory of Computation" by Dexter C. Kozen (Springer) – Some chapters are open-access via Springer's "free for students" promotions.

5. Best Budget Move: Buy Used or Share a Legal Copy

• Used physical copies on Amazon/Flipkart: ₹150–300.
• Form a study group and split the cost of one e-book (many platforms allow 5–6 devices).
• Ask your professor – they often have a desk copy they can lend or scan a chapter for personal use.

Finding "Theory of Computation" by A. A. Puntambekar: Legit Options & Free Alternatives

If you're a computer science student diving into automata theory, formal languages, and computational complexity, you've likely come across "Theory of Computation" by A. A. Puntambekar. It's a popular textbook, especially in Indian universities following the Pune University or RTMNU curricula.

Many students search for a free PDF download—sometimes even a "patched" version (likely meaning corrected or unlocked). Let's be clear: no authorized "patched" PDF exists. That terminology usually points to illegally modified copies from file-sharing sites.

Instead of risking malware or copyright issues, here are legal, safe, and often free ways to get the book or learn TOC.

Option 2: Physical Copy

The paperback edition is widely available on:

• Amazon.in
• Flipkart
• Bookswagon
• Local campus bookstores.

Cost is usually ₹250–₹500 — less than a pizza.