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. Geometry and Billiards
   Serge Tabachnikov | , Published in 1991, 186 pages
2. Dynamics in One Complex Variable
   John Milnor | Princeton University Press, Published in 1991, 146 pages
3. Symplectic, Poisson, and Noncommutative Geometry
   Tohru Eguchi, et al. | Cambridge University Press, Published in 2014, 290 pages
4. An Introduction to the Algebra of Quantics
   E.B. Elliott | The Clarendon Press, Published in 1913, 444 pages
5. Fractals
   | Wikibooks, Published in 2013
6. The Mathematics of Investment
   William L.Hart | D.C Heath and Company, Published in 1924, 321 pages
7. A Primer on Homotopy Colimits
   Daniel Dugger | University of Oregon, Published in 2008, 72 pages
8. Calculus for Mathematicians, Computer Scientists, and Physicists
   Andrew D. Hwang | Holy Cross, Published in 1998, 487 pages
9. Chance and Luck
   Richard A. Proctor | Longmans, Green, and Co., Published in 1887, 164 pages
10. Theory and Applications of Lattice Point Methods for Binomial Ideals
    Ezra Miller | arXiv, Published in 2010, 57 pages
11. Logic for Computer Science
    | Wikibooks, Published in 2010
12. Men of Mathematics
    E.T. Bell | Archive.org, Published in 1937
13. Lectures on Shimura Varieties
    A. Genestier, B.C. Ngo | , Published in 2006, 50 pages
14. First Principles of Symmetrical Beauty
    David Ramsay Hay | W. Blackwood and sons, Published in 1846, 305 pages
15. Category Theory: A Gentle Introduction
    Peter Smith | Logic Matters, Published in 2016, 283 pages
16. Functional and Structured Tensor Analysis for Engineers
    R. M. Brannon | The University of Utah, Published in 2003, 323 pages
17. Introduction to Mathematical Logic: A problem solving course
    Arnold W. Miller | arXiv, Published in 1996, 75 pages
18. Combinatorics Through Guided Discovery
    Kenneth P. Bogart | Dartmouth College, Published in 2004, 202 pages
19. A Problem Text in Advanced Calculus
    John M. Erdman | Portland State University, Published in 2008, 377 pages
20. Lectures on Topics in Mean Periodic Functions and the Two-Radius Theorem
    J. Delsarte | Tata Institute of Fundamental Research, Published in 1961, 151 pages
21. Conic Sections Treated Geometrically
    W. H. Besant | George Bell and Sons, Published in 1895, 367 pages
22. Calculus and Differential Equations
    John Avery | Learning Development Institute, Published in 2010, 137 pages
23. A Treatise on the Theory of Invariants
    Oliver E. Glenn | Project Gutenberg, Published in 2006, 221 pages
24. A History Of The Mathematical Theory Of Probability
    I. Todhunter | Kessinger Publishing, LLC, Published in 2007, 640 pages
25. Matrix Analysis
    Steven J Cox | Rice University, Published in 2012, 98 pages
26. Differential Equations
    H. B. Phillips | John Wiley & Sons, Published in 1922, 84 pages
27. The Axiomatic Method
    L. Henkin, P. Suppes, A. Tarski | North Holland Publishing Company, Published in 1959, 508 pages
28. Sam Loyd's Cyclopedia of 5000 Puzzles tricks and Conundrums
    Sam Loyd | The Lamb Publishing Company, Published in 1914, 194 pages
29. Convergence of Stochastic Processes
    D. Pollard | Springer, Published in 1984, 223 pages
30. Topics in the Theory of Quadratic Residues
    Steve Wright | arXiv, Published in 2014, 160 pages
31. Basic Concepts of Enriched Category Theory
    Max Kelly | Cambridge University Press, Published in 2005, 143 pages
32. Lie Groups in Physics
    G. 't Hooft, M. J. G. Veltman | Utrecht University, Published in 2007, 75 pages
33. Introduction to Commutative Algebra
    Thomas J. Haines | University of Maryland, Published in 2005, 87 pages
34. Model Theory
    Stephen G. Simpson | The Pennsylvania State University, Published in 1998, 127 pages
35. Complex Analysis
    Christian Berg | Kobenhavns Universitet, Published in 2012, 192 pages
36. Differential Topology
    Bjorn Ian Dundas | Johns Hopkins University, Published in 2002, 183 pages
37. Introduction to Abstract Algebra
    D. S. Malik, John N. Mordeson, M.K. Sen | Creighton University, Published in 2007, 276 pages
38. Chaos: Classical and Quantum
    Predrag Cvitanovic | ChaosBook.org, Published in 2008, 813 pages
39. Lectures on Complex Analytic Manifolds
    L. Schwartz | Tata Institute of Fundamental Research, Published in 1955, 163 pages
40. Linear Algebra
    Benjamin McKay | University College Cork, Published in 2008, 491 pages
41. Handbook of Mathematical Functions
    M. Abramowitz, I. A. Stegun | GPO, Published in 1964, 1046 pages
42. Complex Manifolds and Hermitian Differential Geometry
    Andrew D. Hwang | University of Toronto, Published in 1997, 113 pages
43. Ends of Complexes
    Bruce Hughes, Andrew Ranicki | Cambridge University Press, Published in 2008, 375 pages
44. Flavors of Geometry
    Silvio Levy | Cambridge University Press, Published in 1997, 208 pages
45. First Book in Arithmetic
    | W.W. Shannon, Published in 1905, 268 pages
46. A History of Mathematics
    Florian Cajori | The MacMillan Company, Published in 1909, 556 pages
47. Basic Algebra
    Anthony W. Knapp | , Published in 2016, 762 pages
48. New Directions in Hopf Algebras
    S. Montgomery, H. Schneider | Cambridge University Press, Published in 2002, 485 pages
49. Calculus II
    Paul Dawkins | Lamar University, Published in 2011, 380 pages
50. An Introduction to Geometry
    Wong Yan Loi | National University of Singapore, Published in 2009, 136 pages
51. Multivariable and Vector Analysis
    W W L Chen | Macquarie University, Published in 2008, 203 pages
52. Grassmann Algebra
    John Browne | , Published in 2001, 238 pages
53. A Brief History of Mathematics
    Karl Fink | Open Court Publishing Company, Published in 1900, 366 pages
54. Projective Differential Geometry Old and New
    V. Ovsienko, S. Tabachnikov | Cambridge University Press, Published in 2004, 281 pages
55. Mathematical Reasoning: Writing and Proof
    Ted Sundstrom | Pearson Education, Inc., Published in 2013, 591 pages
56. Seven Sketches in Compositionality: An Invitation to Applied Category Theory
    Brendan Fong, David I Spivak | arXiv.org, Published in 2018, 243 pages
57. The Mathemagician and Pied Puzzler: A Collection in Tribute to Martin Gardner
    Martin Gardner, at al. | AK Peters, Published in 1999, 252 pages
58. Lectures on Periodic Homogenization of Elliptic Systems
    Zhongwei Shen | arXiv.org, Published in 2017, 246 pages
59. Practical Foundations of Mathematics
    Paul Taylor | Cambridge University Press, Published in 1999, 588 pages
60. Surveys in Noncommutative Geometry
    Nigel Higson, John Roe | American Mathematical Society, Published in 2006, 208 pages
61. Algorithms for Modular Elliptic Curves
    J. E. Cremona | Cambridge University Press, Published in 1992, 351 pages
62. A Minimum of Stochastics for Scientists
    Noel Corngold | Caltech, Published in 2009, 77 pages
63. Basic Category Theory
    Tom Leinster | arXiv, Published in 2016, 191 pages
64. Essays on the Theory of Numbers
    Richard Dedekind | The Open Court Publishing, Published in 1901, 78 pages
65. Discrete Differential Geometry: An Applied Introduction
    M. Desbrun, P. Schroeder, M. Wardetzky | Columbia University, Published in 2008, 103 pages
66. Topics in dynamics I: Flows
    Edward Nelson | Princeton University Press, Published in 1969, 122 pages
67. Trends in Commutative Algebra
    Luchezar L. Avramov, at al. | Cambridge University Press, Published in 2005, 264 pages
68. Quick Introduction to Tensor Analysis
    Ruslan Sharipov | Samizdat Press, Published in 2004, 47 pages
69. n-Linear Algebra of Type I and Its Applications
    W. B. V. Kandasamy, F. Smarandache | InfoLearnQuest, Published in 2008, 120 pages
70. Recreational Mathematics
    | Wikipedia, Published in 2014
71. Indian Mathematics
    G. R. Kaye | Thacker, Spink & Co., Published in 1915, 102 pages
72. Probability and Statistics
    | UCLA, Published in 2012
73. Gauge Theory for Fiber Bundles
    Peter W. Michor | Universitaet Wien, Published in 1991, 106 pages
74. Descriptive Set Theory
    Yiannis N. Moschovakis | American Mathematical Society, Published in 2009, 516 pages
75. Opera Magistris
    Vincent Isoz | Sciences.ch, Published in 2016, 5273 pages
76. An informal introduction to the ideas and concepts of noncommutative geometry
    Thierry Masson | arXiv, Published in 2006, 56 pages
77. Complex and Adaptive Dynamical Systems: A Primer
    Claudius Gros | arXiv, Published in 2008, 276 pages
78. An Introduction to the Theory of Groups of Finite Order
    Harold Hilton | Oxford Clarendon Press, Published in 1908, 260 pages
79. Fractional Graph Theory: A Rational Approach to the Theory of Graphs
    Daniel Ullman, Edward Scheinerman | Wiley, Published in 2008, 167 pages
80. Engineering Analysis
    | Wikibooks, Published in 2012, 193 pages
81. Elementary Mathematics
    W W L Chen, X T Duong | Macquarie University, Published in 1999, 308 pages
82. Algebraic Geometry
    Andreas Gathmann | University of Kaiserslautern, Published in 2014, 133 pages
83. Algebraic General Topology
    Victor Porton | Mathematics21.org, Published in 2015, 349 pages
84. Probability, Random Processes, and Ergodic Properties
    Robert M. Gray | Springer, Published in 2008, 217 pages
85. Algorithmic Mathematics
    Leonard Soicher, Franco Vivaldi | Queen Mary University of London, Published in 2004, 94 pages
86. Everything you wanted to know about Data Analysis and Fitting
    Peter Young | arXiv, Published in 2012, 55 pages
87. Calculus Made Easy
    Silvanus P. Thompson | The MacMillan Company, Published in 1914, 315 pages
88. An Introduction to Semialgebraic Geometry
    Michel Coste | Universite de Rennes, Published in 2002, 78 pages
89. Introduction to the Basics of Heegaard Floer Homology
    Bijan Sahamie | arXiv, Published in 2010, 71 pages
90. Functional Differential Geometry
    Gerald Jay Sussman, Jack Wisdom | MIT, Published in 2005, 77 pages
91. Parallel Spectral Numerical Methods
    Gong Chen, et al. | Wikibooks, Published in 2013
92. A First Course in Mathematics Concepts for Elementary School Teachers
    Marcel B. Finan | Arkansas Tech University, Published in 2006, 452 pages
93. Algebra: A Computational Introduction
    John Scherk | Chapman & Hall, Published in 2000, 419 pages
94. Surgical Methods in Rigidity
    F.T. Farrell | Springer, Published in 1996, 108 pages
95. Notes on Combinatorics
    Peter J. Cameron | Queen Mary, University of London, Published in 2007, 130 pages
96. Lectures on Disintegration of Measures
    L. Schwartz | Tata Institute of Fundamental Research, Published in 1976, 139 pages
97. Curves and Surfaces in Geometric Modeling: Theory and Algorithms
    Jean Gallier | Morgan Kaufmann, Published in 1999, 502 pages
98. Operator Algebras and Quantum Statistical Mechanics
    Ola Bratteli, Derek W. Robinson | Springer, Published in 2003, 505 pages
99. First Course in Statistics
    D Caradog Jones | G Bell, Published in 1921, 288 pages
100. Math Puzzles
     Umesh P N | , Published in 2010, 84 pages
101. A. N. Whitehead's Geometric Algebra
     Stephen Blake | , Published in 2005, 280 pages
102. Fractional Dynamics
     Carlo Cattani, et al. | De Gruyter Open Ltd, Published in 2016, 408 pages
103. Introduction to Functional Analysis
     Vladimir V. Kisil | University of Leeds, Published in 2010, 111 pages
104. Theory of Functions of a Real Variable
     Shlomo Sternberg | , Published in 2005, 393 pages
105. Combinatorics and Algebra of Tensor Calculus
     Sen Hu, Xuexing Lu, Yu Ye | arXiv, Published in 2015, 88 pages
106. Lectures on Etale Cohomology
     J. S. Milne | , Published in 2008, 196 pages
107. Lecture Notes in Discrete Mathematics
     Marcel B. Finan | Arkansas Tech University, Published in 2001, 224 pages
108. Intro to Abstract Algebra
     Paul Garrett | , Published in 1998, 200 pages
109. Operators on Hilbert Space
     John Erdos | King's College London, Published in 2004, 52 pages
110. Lectures on Lie Groups and Representations of Locally Compact Groups
     F. Bruhat | Tata Institute of Fundamental Research, Published in 1958, 140 pages
111. Geometry Formulas and Facts
     Silvio Levy | CRC Press, Published in 1995
112. Algebraic and Geometric Methods in Enumerative Combinatorics
     Federico Ardila | arXiv, Published in 2014, 143 pages
113. Functions and Their Graphs
     J. Nicholas, J. Hunter, J. Hargreaves | University of Sydney, Published in 1997, 77 pages
114. An Introduction to K-theory
     Eric M. Friedlander | , Published in 2007, 78 pages
115. Recreations in Mathematics
     H E. Licks | D. Van Nostrand Company, Published in 1917, 163 pages
116. Inverse Problem Theory and Methods for Model Parameter Estimation
     Albert Tarantola | SIAM, Published in 2004, 358 pages
117. Course of Linear Algebra and Multidimensional Geometry
     Ruslan Sharipov | Samizdat Press, Published in 1996, 143 pages
118. Current Developments in Algebraic Geometry
     Lucia Caporaso, et al. | Cambridge University Press, Published in 2012, 438 pages
119. An Introductory Course Of Mathematical Analysis
     Charles Walmsley | Cambridge University Press, Published in 1920, 268 pages
120. An Invitation to General Algebra and Universal Constructions
     George M. Bergman | Henry Helson, Published in 1998, 398 pages
121. Lectures on Exterior Differential Systems
     M. Kuranishi | Tata Institute of Fundamental Research, Published in 1962, 117 pages
122. Topics in Random Matrix Theory
     Terence Tao | , Published in 2011, 340 pages
123. Manifolds of Differentiable Mappings
     Peter W. Michor | Birkhauser, Published in 1980, 165 pages
124. Differential Geometrical Theory of Statistics
     Frederic Barbaresco, Frank Nielsen (eds) | MDPI AG, Published in 2017, 474 pages
125. Fundamental Concepts of Mathematics
     Farshid Hajir | University of Massachusetts, Published in 2005, 69 pages
126. Integral Operators
     Leif Mejlbro | BookBoon, Published in 2009, 66 pages
127. Linear Algebra C-4: Quadratic equations in two or three variables
     Leif Mejlbro | BookBoon, Published in 2009, 74 pages
128. Unfolding the Labyrinth: Open Problems in Mathematics, Physics, Astrophysics
     Florentin Smarandache, at al. | arXiv, Published in 2006, 139 pages
129. Axiomatic Set Theory
     Michael Meyling | , Published in 2011, 36 pages
130. Stats without Tears
     Stan Brown | BrownMath.com, Published in 2016, 243 pages
131. Lectures on Deformations of Singularities
     Michael Artin | Tata Institute of Fundamental Research, Published in 1976, 110 pages
132. An Introduction to Nonassociative Algebras
     Richard D. Schafer | Project Gutenberg, Published in 2008, 81 pages
133. Lectures on a Method in the Theory of Exponential Sums
     M. Jutila | Tata Institute of Fundamental Research, Published in 1987, 134 pages
134. A First Course in Elementary Differential Equations
     Marcel B. Finan | Arkansas Tech University, Published in 2006, 213 pages
135. Basic Math Quick Reference Handbook
     Peter J. Mitas | Quick Reference Handbooks, Published in 2009, 83 pages
136. Lectures On The General Theory Of Integral Functions
     Georges Valiron | Chelsea Pub. Co., Published in 1949, 234 pages
137. Theory and Applications of Finite Groups
     G. A. Miller, H. F. Blichfeldt, L. E. Dickson | J. Wiley, Published in 1916, 424 pages
138. Random Matrix Models and Their Applications
     Pavel Bleher, Alexander Its | Cambridge University Press, Published in 2001, 438 pages
139. Theory of Functions of a Complex Variable
     Heinrich Burkhardt | D. C. Heath, Published in 1913, 456 pages
140. Advanced Algebra
     Anthony W. Knapp | Birkhäuser, Published in 2016, 758 pages
141. 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
142. Projective Differential Geometry Of Curves And Surfaces
     Ernest Preston Lane | The University Of Chicago Press, Published in 1932, 344 pages
143. Principles of Differential Geometry
     Taha Sochi | viXra, Published in 2016, 161 pages
144. Probability for Finance
     Patrick Roger | BookBoon, Published in 2010, 115 pages
145. The Axioms Of Descriptive Geometry
     Alfred North Whitehead | Cambridge University Press, Published in 1914, 96 pages
146. Homeomorphisms in Analysis
     Casper Goffman, at al. | American Mathematical Society, Published in 1997, 216 pages
147. Abel's Theorem and the Allied Theory
     H.F. Baker | Cambridge University Press, Published in 1897, 712 pages
148. Statistics
     Philip B. Stark | University of California, Berkeley, Published in 2011
149. A Mathematics Primer for Physics Graduate Students
     Andrew E. Blechman | , Published in 2007, 78 pages
150. Language, Proof and Logic
     Jon Barwise, John Etchemendy | Center for the Study of Language, Published in 2011, 620 pages
151. Arimaa
     | Wikibooks, Published in 2011
152. Proofs and Types
     J. Girard, Y. Lafont, P. Taylor | Cambridge University Press, Published in 1989, 183 pages
153. Manifolds
     Neil Lambert | King's College London, Published in 2011, 59 pages
154. Notes on Algebraic Structures
     Peter J. Cameron | Queen Mary, University of London, Published in 2006, 102 pages
155. Introduction to Infinitesimal Analysis: Functions of One Real Variable
     N. J. Lennes | John Wiley & Sons, Published in 1907, 225 pages
156. Applied Analysis
     I.M. Sigal, M. Merkli | University of Toronto, Published in 2001, 176 pages
157. Langlands Correspondence for Loop Groups
     Edward Frenkel | Cambridge University Press, Published in 2007, 393 pages
158. Homogeneous Spaces and Equivariant Embeddings
     Dmitri A. Timashev | arXiv, Published in 2006, 250 pages
159. Languages and Machines
     C. D. H. Cooper | Macquarie University, Published in 2008
160. Hack, Hack, Who's There? A Gentle Introduction to Model Theory
     David Reid | Smashwords, Published in 2016, 273 pages
161. Undergraduate Analysis Tools
     Bruce K. Driver | University of California, San Diego, Published in 2013, 186 pages
162. Lectures on Differential Equations
     Craig A. Tracy | University of California, Published in 2011, 131 pages
163. Geometry and the Imagination
     Conway, Doyle, Thurston | Rutgers University, Newark, Published in 2018, 116 pages
164. Topics in Differential Geometry
     Peter W. Michor | American Mathematical Society, Published in 2008, 429 pages
165. Elementary Topology
     O. Ya. Viro, O. A. Ivanov, N. Yu. Netsvetaev, V. M. Kharlamov | American Mathematical Society, Published in 2008, 400 pages
166. Calculus of Differential Forms: Course
     Peter Saveliev | Intelligent Perception, Published in 2013
167. Advanced Algebra
     Herbert E. Hawkes | Ginn and Company, Published in 1905, 314 pages
168. Six Septembers: Mathematics for the Humanist
     Patrick Juola, Stephen Ramsay | Zea Books, Published in 2017, 433 pages
169. Topology Without Tears
     Sidney A. Morris | , Published in 2007, 373 pages
170. Lie groups and Lie algebras
     N. Reshetikhin, V. Serganova, R. Borcherds | UC Berkeley, Published in 2006, 179 pages
171. Circulants
     Alun Wyn-jones | , Published in 2008, 149 pages
172. Online Statistics Education
     David Lane | Rice University, Published in 2017, 692 pages
173. Vector Analysis and Quaternions
     Alexander Macfarlane | John Wiley & Sons, Published in 1906, 65 pages
174. Commutative Algebra and Noncommutative Algebraic Geometry
     David Eisenbud, et al. | Cambridge University Press, Published in 2015, 775 pages
175. Representation Theory of Compact Groups
     Michael Ruzhansky, Ville Turunen | Aalto TKK, Published in 2008, 135 pages
176. Nonlinear Analysis and Differential Equations
     Klaus Schmitt, Russell C. Thompson | University of Utah, Published in 2004, 158 pages
177. An Introduction to Group Theory: Applications to Mathematical Music Theory
     Flor Aceff-Sanchez, et al. | BookBoon, Published in 2013, 165 pages
178. Euclid's Elements
     D.E.Joyce | , Published in 1998
179. The Adams-Novikov Spectral Sequence and the Homotopy Groups of Spheres
     Paul Goerss | Northwestern University, Published in 2007, 47 pages
180. A set of new Smarandache functions, sequences and conjectures in number theory
     Felice Russo | American Research Press, Published in 2000, 114 pages
181. A Summary of Calculus
     Karl Heinz Dovermann | University of Hawaii, Published in 2003, 164 pages
182. Discrete Distributions
     Leif Mejlbro | BookBoon, Published in 2009, 72 pages
183. Algebraic Groups and Discontinuous Subgroups
     Armand Borel, George D. Mostow | American Mathematical Society, Published in 1966, 426 pages
184. Harmonic Analysis
     S.R.S. Varadhan | New York University, Published in 2000, 82 pages
185. How We Got From There to Here: A Story of Real Analysis
     Robert Rogers, Eugene Boman | Open SUNY Textbooks, Published in 2013, 210 pages
186. Advanced Algebra
     Arthur Schultze | The Macmillan Company, Published in 1906, 588 pages
187. Differential and Integral Equations: Boundary Value Problems and Adjoints
     S. Schwabik, M. Tvrdy, O. Vejvoda | Academia Praha, Published in 1979, 246 pages
188. Introduction to Algebraic Geometry
     Yuriy Drozd | , Published in 1999, 104 pages
189. A Second Course in Logic
     Christopher Gauker | University of Cincinnati, Published in 2013, 172 pages
190. Galois Groups and Fundamental Groups
     Leila Schneps | Cambridge University Press, Published in 2003, 467 pages
191. Advanced High School Statistics
     David M Diez, et al. | OpenIntro, Published in 2017, 458 pages
192. On Some of Smarandache's Problems
     Krassimir Atanassov | Erhus Univ Pr, Published in 1999, 89 pages
193. Calculus and Linear Algebra. Vol. 2
     Wilfred Kaplan, Donald J. Lewis | University of Michigan Library, Published in 2007, 606 pages
194. The Algebra of Logic
     Louis Couturat | Project Gutenberg, Published in 2004, 102 pages
195. An Introduction to Determinants
     William Thomson | , Published in 1882, 122 pages
196. Iterative Methods for Linear and Nonlinear Equations
     C.T. Kelley | SIAM, Published in 1995, 172 pages
197. Category Theory for Programmers
     Bartosz Milewski | unglue.it, Published in 2017, 510 pages
198. A Second Course in Mathematics Concepts for Elementary Teachers
     Marcel B. Finan | Arkansas Tech University, Published in 2006, 468 pages
199. Almost None of the Theory of Stochastic Processes
     Cosma Rohilla Shalizi | Carnegie Mellon University, Published in 2010, 347 pages
200. Functional Analysis
     Feng Tian, Palle E.T. Jorgensen | arXiv, Published in 2010, 98 pages
201. Existence, multiplicity, perturbation, and concentration results for a class of quasi-linear elliptic problems
     Marco Squassina | Electronic Journal of Differential Equations, Published in 2006, 213 pages
202. Lectures on Analytic Differential Equations
     Yulij Ilyashenko, Sergei Yakovenko | American Mathematical Society, Published in 2007, 599 pages
203. Categories and Modules
     Takahiro Kato | viXra.org, Published in 2015, 323 pages
204. Elementary Differential Equations
     William F. Trench | Brooks Cole, Published in 2001, 663 pages
205. The Basics of Financial Mathematics
     Richard F. Bass | , Published in 2003, 106 pages
206. Calculus Refresher
     Paul Garrett | , Published in 2008, 78 pages
207. Notes on Categories and Groupoids
     P. J. Higgins | Van Nostrand Reinhold, Published in 1971, 195 pages
208. Vector Analysis and the Theory of Relativity
     Francis Dominic Murnaghan | Johns Hopkins press, Published in 1922, 156 pages
209. Introduction to Vectors
     Christopher C. Tisdell | Bookboon, Published in 2014, 68 pages
210. Notes on Operator Algebras
     G. Jungman | Los Alamos National Laboratory, Published in 1999, 60 pages
211. Complex Variables: Second Edition
     R. B. Ash, W. P. Novinger | Dover Publications, Published in 2007, 224 pages
212. Basic Real Analysis
     Anthony W. Knapp | Birkhäuser, Published in 2016, 840 pages
213. Lectures On Unique Factorization Domains
     P. Samuel | Tata Institute Of Fundamental Research, Published in 1964, 68 pages
214. APEX Calculus
     Gregory Hartman, et al. | APEXcalculus.com, Published in 2015, 874 pages
215. Introduction to Statistical Thought
     Michael Lavine | , Published in 2008, 434 pages
216. Elementary Calculus: An Approach Using Infinitesimals
     H. Jerome Keisler | Bodgen & Quigley, Published in 2012, 992 pages
217. Riemannian Geometry
     Richard L. Bishop | arXiv, Published in 2013, 67 pages
218. An Introduction to K-theory and Cyclic Cohomology
     Jacek Brodzki | arXiv, Published in 1996, 115 pages
219. An Introduction to Set Theory
     William A. R. Weiss | University of Toronto, Published in 2008, 119 pages
220. Lectures on Semi-group Theory and its Application to Cauchy's Problem in Partial Differential Equations
     K. Yosida | Tata Institute of Fundamental Research, Published in 1957, 160 pages
221. Mathematics for Engineers
     William Neville Rose | Chapman, Published in 1922
222. Riemannian Geometry
     Ilkka Holopainen, Tuomas Sahlsten | , Published in 2013, 102 pages
223. Varieties of Lattices
     Peter Jipsen, Henry Rose | Springer, Published in 1992, 168 pages
224. Sets, Relations, Functions
     Ivo Düntsch, Günther Gediga | Methodos Publishers (UK), Published in 2000, 55 pages
225. Reform Calculus
     Marcel B. Finan | Arkansas Tech University, Published in 2004, 253 pages
226. Ordinary Differential Equations
     Wong Yan Loi | National University of Singapore, Published in 2013, 121 pages
227. Euclid's Parallel Postulate: Its Nature, Validity and Place in Geometrical Systems
     John William Withers | Open Court Publishing Co., Published in 1904, 214 pages
228. Linear Algebra
     Jonathan Gleason | University of California, Published in 2018, 681 pages
229. Mathematical Methods of Engineering Analysis
     Erhan Cinlar, Robert J. Vanderbei | , Published in 2000, 119 pages
230. Interval Groupoids
     W. B. V. Kandasamy, F. Smarandache, M. K. Chetry | arXiv, Published in 2010, 240 pages
231. On Lie Algebras Of Prime Characteristic
     George B. Seligman | American Mathematical Society, Published in 1956, 93 pages
232. SPSS: Stats Practically Short and Simple
     Sidney Tyrrell | BookBoon, Published in 2009, 83 pages
233. Geometric Models for Noncommutative Algebra
     Ana Cannas da Silva, Alan Weinstein | University of California at Berkeley, Published in 1998, 194 pages
234. Quantum Physics, Relativity, and Complex Spacetime
     Gerald Kaiser | University of Massachusetts at Lowell, Published in 2003, 252 pages
235. Elliptic Curves over Function Fields
     Douglas Ulmer | arXiv, Published in 2011, 72 pages
236. A Course in Universal Algebra
     S. Burris, H.P. Sankappanavar | Springer-Verlag, Published in 1982, 331 pages
237. Analytic geometry for colleges, universities, and technical schools
     E.W. Nichols | Leach, Shewell & Sanborn, Published in 1892, 304 pages
238. Art Gallery Theorems and Algorithms
     Joseph O'Rourke | Oxford University Press, Published in 1987, 296 pages
239. Understanding Calculus
     Faraz Hussain | , Published in 2008
240. Markov Chains and Mixing Times
     D. A. Levin, Y. Peres, E. L. Wilmer | American Mathematical Society, Published in 2008, 387 pages
241. Lectures on Probability, Statistics and Econometrics
     Marco Taboga | statlect.com, Published in 2010
242. Partial Differential Equations with Maple
     Robert Piche, Keijo Ruohonen | Tampere University of Technology, Published in 1997, 131 pages
243. Lectures on Fundamental Concepts of Algebra and Geometry
     John Wesley Young | Macmillan and co., Published in 1917, 264 pages
244. An Introductory Course in Elementary Number Theory
     Wissam Raji | The Saylor Foundation, Published in 2013, 171 pages
245. Entropy of Compact Group Automorphisms
     Thomas Ward | University of East Anglia, Published in 2001, 84 pages
246. Special Fuzzy Matrices for Social Scientists
     W. B. V. Kandasamy, F. Smarandache, K. Ilanthenral | InfoLearnQuest, Published in 2007, 302 pages
247. A Text-Book of Geometry
     G. A. Wentworth | Ginn & Company, Published in 1898, 264 pages
248. Logics of Time and Computation
     Robert Goldblatt | Center for the Study of Language, Published in 1992, 200 pages
249. Lectures on Mean Periodic Functions
     J.P. Kahane | Tata Institute of Fundamental Research, Published in 1959, 165 pages
250. Statistics for the Social and Behavioral Sciences
     David A. Kenny | Little, Brown, Published in 1987, 407 pages
251. College Trigonometry
     Carl Stitz, Jeff Zeager | Stitz Zeager Open Source Mathematics, Published in 2013, 398 pages
252. Proofs and Concepts: the fundamentals of abstract mathematics
     Dave Witte Morris, Joy Morris | University of Lethbridge, Published in 2009, 220 pages
253. Lectures On Galois Cohomology of Classical Groups
     M. Kneser | Tata Institute of Fundamental Research, Published in 1969, 212 pages
254. Euclid's 'Elements' Redux
     Daniel Callahan | starrhorse.com, Published in 2013, 219 pages
255. Statistical Inference for Everyone
     Brian S Blais | Save The Broccoli Publishing, Published in 2014, 200 pages
256. The Principles Of Mathematics
     Bertrand Russell | W. W. Norton & Company, , 579 pages
257. Functional Analysis
     Gerald Teschl | University of Vienna, Published in 2009, 142 pages
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449. Introduction to Graphs
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450. Numerical Algorithms: Methods for Computer Vision, Machine Learning, and Graphics
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464. Vector Calculus, with Applications to Physics
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