Free Mathematics Books

Here is an unordered list of online mathematics books, textbooks, monographs, lecture notes, and other mathematics related documents freely available on the web. I tried to select only the works in book formats, "real" books that are mainly in PDF format, so many well-known html-based mathematics web pages and online tutorials are left out. Click here if you prefer a categorized directory of mathematics books. The list is updated on a daily basis, so, if you want to bookmark this page, use one of the buttons below.

1. Mathematics and Physical Science in Classical Antiquity
   J. L. Heiberg | Oxford University Press, Published in 1922, 115 pages
2. Lectures On Galois Cohomology of Classical Groups
   M. Kneser | Tata Institute of Fundamental Research, Published in 1969, 212 pages
3. Elementary Calculus: An Approach Using Infinitesimals
   H. Jerome Keisler | Bodgen & Quigley, Published in 2012, 992 pages
4. A Treatise on Probability
   John Maynard Keynes | Macmillan and co, Published in 1921, 561 pages
5. Differential Geometry of Indefinite Complex Submanifolds in Indefinite Complex Space Forms
   Alfonso Romero, Young Jin Suh | , Published in 2004, 60 pages
6. Modern Geometry
   Robert Sharpley | University of South Carolina, Published in 2008, 230 pages
7. Lectures on Linear Logic
   A. S. Troelstra | CSLI, Published in 1992, 215 pages
8. Higher Operads, Higher Categories
   Tom Leinster | arXiv, Published in 2003, 410 pages
9. Applied Analysis
   J. Hunter, B. Nachtergaele | World Scientific Publishing Company, Published in 2005, 439 pages
10. Category Theory in Context
    Emily Riehl | Dover Publications, Published in 2016, 258 pages
11. Mathematics for Computer Scientists
    Gareth J. Janacek, Mark L. Close | BookBoon, Published in 2008, 153 pages
12. First Year Calculus
    W W L Chen | Macquarie University, Published in 2008, 238 pages
13. Mathematics and Physics of Emerging Biomedical Imaging
    National Research Council | National Academies Press, Published in 1996, 238 pages
14. Yet Another Calculus Text
    Dan Sloughter | , Published in 2007, 147 pages
15. The Manual of Mathematical Magic
    Peter McOwan | Queen Mary, University of London, Published in 2010, 96 pages
16. Optimization Models For Decision Making
    Katta G. Murty | Springer, Published in 2010, 482 pages
17. Introduction to Applied Linear Algebra: Vectors, Matrices and Least Squares
    Stephen Boyd, Lieven Vandenberghe | Cambridge University Press, Published in 2018, 473 pages
18. Conformal Fractals: Ergodic Theory Methods
    F. Przytycki, M. Urbanski | Cambridge University Press, Published in 2009, 362 pages
19. Fourier Series and Systems of Differential Equations and Eigenvalue Problems
    Leif Mejlbro | BookBoon, Published in 2007, 125 pages
20. Representations of Reductive p-adic Groups
    Fiona Murnaghan | University of Toronto, Published in 2009, 128 pages
21. Algebraic K-Theory
    Olivier Isely | EPFL, Published in 2006, 45 pages
22. Lectures on Representations of Complex Semi-Simple Lie Groups
    Thomas J. Enright | Tata Institute of Fundamental Research, Published in 1981, 94 pages
23. Applied Mathematical Programming Using Algebraic Systems
    Bruce A. McCarl, Thomas H. Spreen | Texas A&M University, Published in 2011, 567 pages
24. Algebraic Geometry
    J.S. Milne | , Published in 2008, 241 pages
25. Lectures on Harmonic Analysis
    Thomas Wolff | American Mathematical Society, Published in 2003, 85 pages
26. An Introductory Single Variable Real Analysis
    Marcel B. Finan | Arkansas Tech University, Published in 2009, 179 pages
27. Vector Analysis
    J. Willard Gibbs | Yale University Press, Published in 1929, 432 pages
28. Tilings and Patterns
    E O Harriss | Mathematicians.org.uk, Published in 2008, 43 pages
29. Collections of Problems on Smarandache Notions
    Charles Ashbacher | Erhus University Press, Published in 1996, 75 pages
30. Understanding Algebra
    James W. Brennan | , Published in 2011, 106 pages
31. A Handbook of Statistics
    Darius Singpurwalla | Bookboon, Published in 2013, 79 pages
32. Numerical Recipes in Fortran 90
    William H. Press, at al. | Cambridge University Press, Published in 1996, 500 pages
33. Differential and Integral Equations: Boundary Value Problems and Adjoints
    S. Schwabik, M. Tvrdy, O. Vejvoda | Academia Praha, Published in 1979, 246 pages
34. Contributions to Fourier Analysis
    A. Zygmund, et al. | Princeton University Press, Published in 1950, 207 pages
35. Handbook of Graph Drawing and Visualization
    Roberto Tamassia (ed.) | CRC Press, Published in 2013, 862 pages
36. Introductory Maths for Chemists
    J. E. Parker | Bookboon, Published in 2013, 136 pages
37. Integral Calculus
    Leah Edelstein-Keshet | University of British Columbia, Published in 2010, 267 pages
38. Linear Complementarity, Linear and Nonlinear Programming
    Katta G. Murty | , Published in 1997, 613 pages
39. Topology Illustrated
    Peter Saveliev | Intelligent Perception, Published in 2014, 301 pages
40. Spherical Harmonics in p Dimensions
    Christopher Frye, Costas J. Efthimiou | arXiv, Published in 2012, 95 pages
41. Mixed Motives
    Marc Levine | American Mathematical Society, Published in 1998, 91 pages
42. Introduction to Mathematical Analysis
    B. Lafferriere, G. Lafferriere, N. Mau Nam | Portland State University Library, Published in 2015, 141 pages
43. Thin Groups and Superstrong Approximation
    Emmanuel Breuillard, Hee Oh (eds.) | Cambridge University Press, Published in 2014, 362 pages
44. Integrate Your Brain: How To Do Calculus In Your Head
    Aaron Maxwell | Lulu.com, Published in 2006, 51 pages
45. Banach Spaces of Analytic Functions
    enneth Hoffman | Prentice-Hall, Published in 1962, 242 pages
46. Fundamentals of Mathematics
    Denny Burzynski, Wade Ellis | OpenStax CNX, Published in 2023, 910 pages
47. Notes on String Topology
    Ralph L. Cohen, Alexander A. Voronov | arXiv, Published in 2005, 95 pages
48. Combinatorial and Computational Geometry
    J. E. Goodman, J. Pach, E. Welzl | Cambridge University Press, Published in 2007, 616 pages
49. Modern Algebraic Topology
    D. G. Bourgin | Macmillan, Published in 1963, 544 pages
50. Infinite-dimensional Lie Algebras
    Iain Gordon | University of Edinburgh, Published in 2009, 55 pages
51. Convex Geometric Analysis
    Keith Ball, Vitali Milman | Cambridge University Press, Published in 1998, 236 pages
52. Recreations in Mathematics
    H E. Licks | D. Van Nostrand Company, Published in 1917, 163 pages
53. Calculus and Linear Algebra. Vol. 1
    Wilfred Kaplan, Donald J. Lewis | University of Michigan Library, Published in 2007, 712 pages
54. Calculus for Beginners and Artists
    Daniel Kleitman | MIT, Published in 2009
55. Lectures on Discrete and Polyhedral Geometry
    Igor Pak | UCLA, Published in 2008, 428 pages
56. Topics in Discrete Mathematics
    A.F. Pixley | Harvey Mudd College, Published in 2010, 173 pages
57. Analytic Geometry of Space
    V. Snyder, T.P. Hill | H. Holt and Company, Published in 1914, 322 pages
58. Notes on Automorphic Functions
    Anders Thorup | Kobenhavns Universitet, Published in 1995, 186 pages
59. Surgical Methods in Rigidity
    F.T. Farrell | Springer, Published in 1996, 108 pages
60. Discrete Mathematics
    | Wikibooks, Published in 2012
61. Lecture Notes on Embedded Contact Homology
    Michael Hutchings | arXiv, Published in 2013, 88 pages
62. Numerical Solutions of Engineering Problems
    K. Nandakumar | University of Alberta, Published in 1998, 193 pages
63. An Introduction to Riemannian Geometry with Applications to Mechanics and Relativity
    Leonor Godinho, Jose Natario | , Published in 2004, 272 pages
64. Symmetry and Separation of Variables
    Willard Miller | Addison-Wesley, Published in 1977, 318 pages
65. Functional Differential Geometry
    Gerald Jay Sussman, Jack Wisdom | MIT, Published in 2005, 77 pages
66. Differential Topology
    Bjorn Ian Dundas | Johns Hopkins University, Published in 2002, 183 pages
67. Introduction to Vectors and Tensors Volume 2: Vector and Tensor Analysis
    Ray M. Bowen, C.-C. Wang | , Published in 2008, 246 pages
68. Advances in Discrete Differential Geometry
    Alexander I. Bobenko (ed.) | Springer, Published in 2016, 439 pages
69. Applied Combinatorics
    Mitchel T. Keller, William T. Trotter | Georgia Institute of Technology, Published in 2013, 345 pages
70. Lectures on Statistics
    Robert B. Ash | University of Illinois, Published in 2007
71. Elementary Textbook on the Calculus
    Virgil Snyder | Cornell University Library, Published in 1912, 388 pages
72. The Principles Of Mathematics
    Bertrand Russell | W. W. Norton & Company, , 579 pages
73. Elements of the Differential and Integral Calculus
    William Anthony Granville | Ginn, Published in 1911, 493 pages
74. Stochastic Differential Equations: Models and Numerics
    Anders Szepessy, et al. | KTH, Published in 2010, 202 pages
75. Magic Squares and Cubes
    W. S. Andrews | Open Court Publishing Company, Published in 1917, 428 pages
76. Residues and Duality
    Robin Hartshorne | Springer, Published in 1966, 434 pages
77. Enumerative Combinatorics: Volume 1
    Richard P. Stanley | MIT, Published in 2011, 725 pages
78. How To Write Proofs
    Larry W. Cusick | California State University, Fresno, Published in 2009
79. Pictures of Julia and Mandelbrot Sets
    | Wikibooks, Published in 2010
80. An Introduction to Complex Algebraic Geometry
    Chris Peters | Institut Fourier Grenoble, Published in 2004, 129 pages
81. Stochastic Integration and Stochastic Differential Equations
    Klaus Bichteler | University of Texas, Published in 2002, 643 pages
82. Statistics for Health, Life and Social Sciences
    Denis Anthony | BookBoon, Published in 2011, 292 pages
83. Discrepancy Theory
    William Chen | Macquarie University, Published in 2012, 99 pages
84. Bayesian Networks: Advances and Novel Applications
    Douglas McNair (ed.) | IntechOpen, Published in 2019, 256 pages
85. Reasonable Basic Algebra
    Alain Schremmer | FreeMathTexts.org, Published in 2020, 275 pages
86. Algebraic L-theory and Topological Manifolds
    A. A. Ranicki | Cambridge University Press, Published in 2011, 365 pages
87. Basic Calculus Refresher
    Ismor Fischer | University of Wisconsin, Published in 2008, 21 pages
88. Math Puzzles
    Umesh P N | , Published in 2010, 84 pages
89. Mathematics For Engineering Students
    Samuel Keller | D. Van Nostrand Company, Published in 1908, 376 pages
90. Random Matrix Models and Their Applications
    Pavel Bleher, Alexander Its | Cambridge University Press, Published in 2001, 438 pages
91. Computational Statistics
    James E. Gentle | Springer, Published in 2009, 729 pages
92. Elementary Geometry: Practical and Theoretical
    C. Godfrey, A. W. Siddons | Cambridge University Press, Published in 1919, 438 pages
93. Easy Mathematics: Arithmetic and Algebra for General Readers
    Oliver Lodge | The Macmillan Company, Published in 1910, 466 pages
94. Noncommutative Geometry
    Alain Connes | Academic Press, Published in 1994, 654 pages
95. A Panoramic View of Riemannian Geometry
    Marcel Berger | Springer, Published in 2002, 874 pages
96. Diffeomorphisms of Elliptic 3-Manifolds
    S. Hong, J. Kalliongis, D. McCullough, J. H. Rubinstein | arXiv, Published in 2011, 185 pages
97. Euclidean Plane and Its Relatives
    Anton Petrunin | , Published in 2017, 201 pages
98. Math in Society
    David Lippman | Lulu.com, Published in 2013, 432 pages
99. First Course in Statistics
    D Caradog Jones | G Bell, Published in 1921, 288 pages
100. Lectures on Noise Sensitivity and Percolation
     Christophe Garban, Jeffrey E. Steif | arXiv, Published in 2011, 150 pages
101. Introduction to Probability
     Leif Mejlbro | BookBoon, Published in 2009, 61 pages
102. Graphical Calculus
     Arthur Henry Barker | Longmans, Green, and Co., Published in 1896, 188 pages
103. Lectures on Fundamental Concepts of Algebra and Geometry
     John Wesley Young | Macmillan and co., Published in 1917, 264 pages
104. A Course of Modern Analysis
     E. T. Whittaker, G. N. Watson | Cambridge University Press, Published in 1920, 608 pages
105. The Algebra of Invariants
     J.H. Grace, A. Young | Cambridge, University Press, Published in 1903, 404 pages
106. A Short Introduction to Classical and Quantum Integrable Systems
     O. Babelon | , Published in 2007, 145 pages
107. Lectures on Optimization: Theory and Algorithms
     John Cea | Tata Institute of Fundamental Research, Published in 1978, 237 pages
108. A Probability Course for the Actuaries
     Marcel B. Finan | Arkansas Tech University, Published in 2011, 517 pages
109. Advanced Stochastic Processes
     Jan A. Van Casteren | Bookboon, Published in 2013, 404 pages
110. Projective Geometry
     Nigel Hitchin | , Published in 2003, 74 pages
111. Bernoulli Polynomials and Applications
     Omran Kouba | arXiv, Published in 2013, 48 pages
112. Encyclopedia of Mathematics
     | Kluwer Academic Publishers, Published in 2002, 1202 pages
113. Probability Theory
     S. R. S. Varadhan | New York University, Published in 2000, 300 pages
114. A First Course in Linear Algebra
     Robert A. Beezer | University of Puget Sound, Published in 2010, 1035 pages
115. Lectures on Polyhedral Topology
     John R. Stallings | Tata Institute of Fundamental Research, Published in 1967, 214 pages
116. Complex Analysis on Riemann Surfaces
     Curtis McMullen | Harvard University, Published in 2005, 89 pages
117. Introduction to Probability, Statistics, and Random Processes
     Hossein Pishro-Nik | Kappa Research, LLC, Published in 2014, 744 pages
118. Elementary Statistical Methods
     Christian Akrong Hesse | ResearchGate GmbH, Published in 2011, 83 pages
119. Category Theory for Scientists
     David I. Spivak | arXiv, Published in 2013, 261 pages
120. Mathematical Physics II
     Boris Dubrovin | SISSA, Published in 2008, 78 pages
121. Complex Dynamics and Renormalization
     Curtis T. McMullen | Princeton University Press, Published in 1994, 219 pages
122. Mathematical Philosophy: A Study of Fate and Freedom
     Cassius Jackson Keyser | E.P. Dutton & company, Published in 1922, 490 pages
123. Practical Plane and Solid Geometry for Advanced Students
     J. Harrison, G.A. Baxandall | Macmillan, Published in 1899, 584 pages
124. H Ring Spectra and Their Applications
     R. R. Bruner, J. P. May, J. E. McClure, M. Steinberger | Springer, Published in 1986, 400 pages
125. Introduction to Stochastic Analysis
     Michael Roeckner | Universitaet Bielefeld, Published in 2011, 98 pages
126. Course of Analytical Geometry
     Ruslan Sharipov | UFA, Published in 2011, 226 pages
127. Second-order Ordinary Differential Equations
     R.S. Johnson | Bookboon, Published in 2012, 181 pages
128. Abelian Categories: an Introduction to the Theory of Functors
     Peter Freyd | Harper and Row, Published in 1964, 192 pages
129. Numerical Methods for Large Eigenvalue Problems
     Yousef Saad | SIAM, Published in 2011, 285 pages
130. CDBooK: Introduction to Vassiliev Knot invariants
     S.Chmutov, S.Duzhin, J.Mostovoy | Ohio State Universit, Published in 2009, 460 pages
131. Lectures on Elliptic Partial Differential Equations
     J.L. Lions | Tata Institute of Fundamental Research, Published in 1957, 121 pages
132. A First Course in Topology: Continuity and Dimension
     John McCleary | American Mathematical Society, Published in 2006, 210 pages
133. Geometric Complexity Theory: An Introduction for Geometers
     J.M. Landsberg | arXiv, Published in 2013, 38 pages
134. Mathematical Reasoning: Writing and Proof
     Ted Sundstrom | Pearson Education, Inc., Published in 2013, 591 pages
135. The Elements of Non-Euclidean Geometry
     D.M.Y. Sommerville | G. Bell & Sons Ltd., Published in 1919, 300 pages
136. A Course of Pure Geometry: Properties of the Conic Sections
     E.H. Askwith | Cambridge University Press, Published in 1917, 314 pages
137. Operator Algebras and Quantum Statistical Mechanics
     Ola Bratteli, Derek W. Robinson | Springer, Published in 2003, 505 pages
138. Calculus
     Gilbert Strang | Wellsley Cambridge Press, Published in 1991, 671 pages
139. Differential Geometry: A Geometric Introduction
     David W. Henderson | Project Euclid, Published in 2013, 250 pages
140. Precalculus: An Inquiry-Based Approach
     William Mahavier, Paul Howard | Oklahoma Christian University, Published in 2023, 152 pages
141. A First Course in Mathematics Concepts for Elementary School Teachers
     Marcel B. Finan | Arkansas Tech University, Published in 2006, 452 pages
142. Lectures on Some Aspects of p-Adic Analysis
     F. Bruhat | Tata Institute of Fundamental Research, Published in 1963, 147 pages
143. The Hauptvermutung Book: A Collection of Papers on the Topology of Manifolds
     A.A. Ranicki, et al, | Springer, Published in 1996, 194 pages
144. Numerical Methods Course Notes
     Steven E. Pav | University of California at San Diego, Published in 2005, 180 pages
145. Active Calculus
     Matt Boelkins | Grand Valley State University, Published in 2013, 525 pages
146. Higher-Dimensional Categories: an illustrated guide book
     Eugenia Cheng, Aaron Lauda | University of Sheffield, Published in 2004, 182 pages
147. Homological Conjectures
     Tom Marley, Laura Lynch | University of Nebraska - Lincoln, Published in 2010, 56 pages
148. Introduction to Statistical Thought
     Michael Lavine | , Published in 2008, 434 pages
149. Real Functions in One Variable: Simple Differential Equations I
     Leif Mejlbro | BookBoon, Published in 2007, 118 pages
150. Lectures on Siegel's Modular Functions
     H. Maass | Tata Institute of Fundamental Research, Published in 1955, 286 pages
151. The First Six Books of the Elements of Euclid
     John Casey, Euclid | Longmans, Green, and Co., Published in 1885, 233 pages
152. Finite Difference Computing with PDEs
     Hans Petter Langtangen, Svein Linge | Springer, Published in 2017, 507 pages
153. The Essence of Mathematics Through Elementary Problems
     Alexandre Borovik, Tony Gardiner | Open Book Publishers, Published in 2019, 400 pages
154. A Concise Course in Algebraic Topology
     J. P. May | University Of Chicago Press, Published in 1999, 251 pages
155. Quasi-Projective Moduli for Polarized Manifolds
     Eckart Viehweg | Springer, Published in 1995, 326 pages
156. Lectures on Elementary Probability
     William G. Faris | University of Arizona, Published in 2002, 62 pages
157. Set Theoretic Approach to Algebraic Structures in Mathematics
     W. B. Vasantha Kandasamy, Florentin Smarandache | Educational Publisher, Published in 2013, 168 pages
158. Determinants and Matrices
     R. Kochendörfer | Teubner, Published in 1961
159. Indian Mathematics
     G. R. Kaye | Thacker, Spink & Co., Published in 1915, 102 pages
160. Linear Algebra Review and Reference
     Zico Kolter | Stanford University, Published in 2015, 26 pages
161. Functional and Structured Tensor Analysis for Engineers
     R. M. Brannon | The University of Utah, Published in 2003, 323 pages
162. Noncommutative Algebraic Geometry
     Gwyn Bellamy, et al. | Cambridge University Press, Published in 2016, 360 pages
163. Elementary Algebra
     Denny Burzynski, Wade Ellis | College of Southern Nevada, Published in 2023, 1135 pages
164. The Solution of the Pyramid Problem
     Robert Ballard | John Wiley & Sons Ltd., Published in 1882, 109 pages
165. Symbolic Logic: A First Course
     Gary Hardegree | Mcgraw-Hill College, Published in 1999, 468 pages
166. Foundations of geometry for university students and high-school students
     Ruslan Sharipov | arXiv, Published in 2007, 221 pages
167. Stochastic Calculus
     Alan Bain | , Published in 2008, 99 pages
168. Bayesian Spectrum Analysis and Parameter Estimation
     G. Larry Bretthorst | Springer, Published in 1988, 220 pages
169. Introduction To Algebraical Geometry
     A. Clement Jones | Oxford University Press, Published in 1912, 558 pages
170. On Advanced Analytic Number Theory
     C.L. Siegel | Tata Institute of Fundamental Research, Published in 1961, 241 pages
171. Matroid Decomposition
     Klaus Truemper | Leibniz, Published in 1998, 398 pages
172. Introduction to Commutative Algebra
     Thomas J. Haines | University of Maryland, Published in 2024, 93 pages
173. Advanced Algebra
     Arthur Schultze | The Macmillan Company, Published in 1906, 588 pages
174. An Invitation to General Algebra and Universal Constructions
     George M. Bergman | Henry Helson, Published in 1998, 398 pages
175. Introduction to Probability Theory and Statistics for Linguistics
     Marcus Kracht | UCLA, Published in 2005, 137 pages
176. Calculus of Residua: Complex Functions Theory a-2
     Leif Mejlbro | BookBoon, Published in 2010, 140 pages
177. Complex Variables
     R. B. Ash, W. P. Novinger | , Published in 2004, 220 pages
178. Tight and Taut Submanifolds
     Thomas E. Cecil, Shiing-shen Chern | Cambridge University Press, Published in 1997, 349 pages
179. Almost None of the Theory of Stochastic Processes
     Cosma Rohilla Shalizi | Carnegie Mellon University, Published in 2010, 347 pages
180. Temporal Networks
     Petter Holme, Jari Saramäki | arXiv, Published in 2011, 25 pages
181. A Gentle Introduction to Tensors
     Boaz Porat | Technion, Published in 2010, 87 pages
182. The Radon Transform
     Sigurdur Helgason | Birkhauser Boston, Published in 1999, 196 pages
183. Lectures on Moduli of Curves
     D. Gieseker | Tata Institute of Fundamental Research, Published in 1982, 88 pages
184. Lecture Notes on Motivic Cohomology
     Carlo Mazza, Vladimir Voevodsky, Charles Weibel | AMS, Published in 2005, 228 pages
185. Applied Mathematics by Example
     Jeremy Pickles | BookBoon, Published in 2010, 164 pages
186. A Course of Elementary Mathematics
     John Radford Young | Wm. H. Allen, Published in 1862, 658 pages
187. Engineering Analysis
     | Wikibooks, Published in 2012, 193 pages
188. Causal Inference
     Miguel A. Hernan, James M. Robins | Chapman & Hall/CRC, Published in 2015, 352 pages
189. Real Functions in One Variable: Examples of Integrals
     Leif Mejlbro | BookBoon, Published in 2007, 154 pages
190. Graph Theory With Applications
     J.A. Bondy and U.S.R. Murty | Elsevier Science Ltd, Published in 1976, 270 pages
191. Algorithmic Mathematics
     Leonard Soicher, Franco Vivaldi | Queen Mary University of London, Published in 2004, 94 pages
192. Axiom: The Scientific Computation System
     Richard D. Jenks, Robert S. Sutor | axiom-developer.org, Published in 2003, 1200 pages
193. Calculus I, II, and III
     Jerrold E. Marsden, Alan Weinstein | Springer, Published in 1986, 1023 pages
194. Lectures on An Introduction to Grothendieck's Theory of the Fundamental Group
     J.P. Murre | Tata Institute of Fundamental Research, Published in 1967, 143 pages
195. Robust Geometric Computation
     Kurt Mehlhorn, Chee Yap | New York University, Published in 2004
196. History of Modern Mathematics
     David Eugene Smith | Columbia University, Published in 1906, 75 pages
197. Topology
     David Wilkins | Trinity College, Dublin, Published in 2001
198. Engineering Statistics Handbook
     | NIST/SEMATECH, Published in 2003
199. Introduction to Differential Topology, de Rham Theory and Morse Theory
     Michael Muger | Radboud University, Published in 2005, 80 pages
200. Origami and Geometric Constructions
     Robert J. Lang | , Published in 2003, 55 pages
201. A Primer of Real Analysis
     Dan Sloughter | Synechism.org, Published in 2009, 152 pages
202. Statistics
     Philip B. Stark | University of California, Berkeley, Published in 2011
203. Elementary College Geometry
     Henry Africk | CUNY Academic Works, Published in 2013, 376 pages
204. Nonlinear Fourier Analysis
     Terence Tao, Christoph Thiele | arXiv, Published in 2012, 98 pages
205. Correlation and Causality
     David A. Kenny | John Wiley & Sons Inc, Published in 1979, 353 pages
206. Six Septembers: Mathematics for the Humanist
     Patrick Juola, Stephen Ramsay | Zea Books, Published in 2017, 433 pages
207. An Introduction to Nonlinear Optimization Theory
     Marius Durea, Radu Strugariu | De Gruyter Open, Published in 2014, 328 pages
208. Elementary Real Analysis
     B. S. Thomson, J. B. Bruckner, A. M. Bruckner | Prentice Hall, Published in 2001, 735 pages
209. Ordinary Differential Equations
     Dmitry Panchenko | University of Toronto, Published in 2018, 141 pages
210. Introduction to Functional Analysis
     Vladimir V. Kisil | University of Leeds, Published in 2021, 166 pages
211. Introduction to Modal Logic
     Gary Hardegree | UMass Amherst, Published in 2009, 275 pages
212. Elements of Applied Mathematics
     Cobb Herbert E. | Ginn and Company, Published in 1911, 292 pages
213. A Tangled Tale
     Lewis Carroll | Macmillan and Co., Published in 1885, 192 pages
214. Category Theory: A Gentle Introduction
     Peter Smith | Logic Matters, Published in 2016, 283 pages
215. Langlands Correspondence for Loop Groups
     Edward Frenkel | Cambridge University Press, Published in 2007, 393 pages
216. Logic for Computer Science
     Jean H. Gallier | Longman Higher Education, Published in 1986, 528 pages
217. The Philosophy of Mathematics
     Albert Taylor Bledsoe | J.B. Lippincott & Co, Published in 1868, 248 pages
218. Probability, Statistics and Stochastic Processes
     Cosma Rohilla Shalizi | , Published in 2001, 71 pages
219. Linear Algebra: An Introduction to Mathematical Discourse
     | Wikibooks, Published in 2011
220. Notes on the Combinatorial Fundamentals of Algebra
     Darij Grinberg | arXiv.org, Published in 2021, 1359 pages
221. Lectures on Field Theory and Ramification Theory
     Sudhir R. Ghorpade | Indian Institute of Technology, Bombay, Published in 2008, 36 pages
222. Combinatorial Theory
     Gian-Carlo Rota | , Published in 1998, 414 pages
223. Mathematical Illustrations: A Manual of Geometry and PostScript
     Bill Casselman | Cambridge University Press, Published in 2005, 336 pages
224. The Mathematics of Investment
     William L.Hart | D.C Heath and Company, Published in 1924, 321 pages
225. Explaining Logarithms
     Dan Umbarger | Brown Books Publishing Group, Published in 2006, 112 pages
226. OpenIntro Statistics
     D.M. Diez, C.D. Barr, M. Cetinkaya-Rundel | OpenIntro, Published in 2012, 426 pages
227. First Course in the Theory of Equations
     Leonard E. Dickson | John Wiley & Sons, Published in 1922, 207 pages
228. An Introduction to Mathematics
     A. N. Whitehead | Williams & Northgate, Published in 1911, 274 pages
229. The Nature of Mathematics
     Philip E. B. Jourdain | T. C. & E. C. Jack, Published in 1919, 136 pages
230. Applied Discrete Structures
     Al Doerr, Ken Levasseur | Lulu.com, Published in 2013, 496 pages
231. Chance and Luck
     Richard A. Proctor | Longmans, Green, and Co., Published in 1887, 164 pages
232. Euclid and His Twentieth Century Rivals
     Nathaniel Miller | , Published in 2007, 124 pages
233. Surreal Numbers: An Introduction
     Claus Tondering | , Published in 2013, 50 pages
234. Toposes, Triples and Theories
     Michael Barr, Charles Wells | Springer-Verlag, Published in 2005, 302 pages
235. Logic for Computer Scientists
     Uli Furbach | Wikibooks, Published in 2010
236. Galois Theory: Lectures Delivered at the University of Notre Dame
     Emil Artin | University of Notre Dame, Published in 1971, 96 pages
237. Undergraduate Analysis Tools
     Bruce K. Driver | University of California, San Diego, Published in 2013, 186 pages
238. Combinatorial Algorithms
     Albert Nijenhuis, Herbert S. Wilf | Academic Press Inc, Published in 1978, 316 pages
239. Computations in Algebraic Geometry with Macaulay 2
     D. Eisenbud, D. Grayson, M. Stillman, B. Sturmfels | Springer, Published in 2001, 343 pages
240. Armstrong Calculus
     Jared Schlieper, Michael Tiemeyer | GALILEO, University System of Georgia, Published in 2015, 110 pages
241. Stochastic Processes
     Leif Mejlbro | BookBoon, Published in 2012, 263 pages
242. Categories and Homological Algebra
     Pierre Schapira | UPMC, Published in 2011, 125 pages
243. The Design of Approximation Algorithms
     D. P. Williamson, D. B. Shmoys | Cambridge University Press, Published in 2010, 496 pages
244. Categorical Geometry
     Zhaohua Luo | , Published in 1998
245. The Axiomatic Method
     L. Henkin, P. Suppes, A. Tarski | North Holland Publishing Company, Published in 1959, 508 pages
246. Linear Algebra, Infinite Dimensions, and Maple
     James V. Herod | Georgia Tech, Published in 1997
247. Set Theory
     Gary Hardegree | UMass Amherst, Published in 2003
248. Introduction to the Method of Multiple Scales
     Per Jakobsen | arXiv, Published in 2014, 65 pages
249. The Geometry and Topology of Braid Groups
     Jenny Wilson | University of Michigan, Published in 2018, 30 pages
250. A First Course in Ordinary Differential Equations
     Norbert Euler | Bookboon, Published in 2015, 232 pages
251. Real Variables: With Basic Metric Space Topology
     Robert B. Ash | Institute of Electrical & Electronics Engineering, Published in 2007, 213 pages
252. Basic Category Theory
     Tom Leinster | arXiv, Published in 2016, 191 pages
253. The Theory of Lie Derivatives and Its Applications
     Kentaro Yano | North Holland Publishing Co., Published in 1955, 321 pages
254. Elementary Differential Equations
     William F. Trench | Brooks Cole, Published in 2001, 663 pages
255. Elementary Linear Algebra
     Kenneth Kuttler | The Saylor Foundation, Published in 2012, 433 pages
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