From 46d7db6732d8e5f5190011261f3383803cf7d5db Mon Sep 17 00:00:00 2001
From: Steve Berdy <86739818+steveberdy@users.noreply.github.com>
Date: Fri, 6 Sep 2024 13:15:20 -0400
Subject: [PATCH] Use free PDF link for How to Prove It

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 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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 ### Transition To Pure Rigour Math
 * 📝 [Basic Concepts of Mathematics](http://www.trillia.com/zakon1.html) - Elias Zakon
 * 📝 [Book of Proof](https://www.people.vcu.edu/~rhammack/BookOfProof/) - Richard Hammak (Virginia Commonwealth University)
-* 📖💲 [How to Prove It: A Structured Approach (3rd Edition)](https://www.cambridge.org/highereducation/books/how-to-prove-it/6D2965D625C6836CD4A785A2C843B3DA) - Daniel J. Velleman (Professor).
+* 📝 [How to Prove It: A Structured Approach (3rd Edition)](https://ia800501.us.archive.org/7/items/how-to-prove-it-a-structured-approach-daniel-j.-velleman/How%20to%20Prove%20It%20A%20Structured%20Approach%20%28Daniel%20J.%20Velleman%29.pdf) - Daniel J. Velleman (Professor).
 
 ### Set Theory