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 1. [Probability - First Steps](https://archive.org/details/ProbabilityTheoryfirstSteps/page/n9/mode/2up) by E.S. Wentzel 🔥🔥🔥🔥🔥
 2. [Applied Problems in Probability Theory](https://archive.org/details/wentzel-ovcharov-applied-problems-in-probability-theory/page/83/mode/2up) by Wentzel and Ovcharov
-3. [Principles of Mathematical Analysis](https://archive.org/details/principlesofmath00rudi) by Walter Rubin
+3. [Principles of Mathematical Analysis](https://archive.org/details/principlesofmath00rudi) by Walter Rudin
 4. [What is mathemarics](https://www.cimat.mx/~gil/docencia/2017/mate_elem/%5BCourant,Robbins%5DWhat_Is_Mathematics(2nd_edition_1996)v2.pdf) by Richard Courand and Herbert Robbins
 5. [Introduction to matrix analysis](https://eclass.uoa.gr/modules/document/file.php/MATH553/%5BRichard_Bellman%5D_Introduction_to_Matrix_Analysis%2C%28BookFi.org%29.pdf) by Richard Bellman
 6. [Combinatorial mathematics for recreation](https://archive.org/details/VilenkinCombinatorialMathematics) Vilenkin