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Top 100* Mathematical Websites

This is a list of places on the web that I like and have personally found useful.
It is frequently added to (about once a week), *currently with 131 entries.
Last year, to aid navigation, I reorganised the list into categories.
I'm always open to suggestions of websites that should be added.
Send recommendations to me via the contact page.
Last updated : 8th June 2024

Famous Mathematicians
01. Award winning website from St Andrews University, Scotland
      Biographies of around 3000 mathematicians
Art of a Mathematical Nature
02. Lovely video of Islamic Geometric Artist: Samira Mian
      Plus a gallery of her work
03. Islamic Geometric Art from Hasrat Brown
04. Number Wonder's very own Art Gallery
05. Easy online turtle graphics geometric art programming in Scratch
06. Classic Resource: The Geometry Junkyard
 Puzzles and Problems
07. The famous puzzles website Cut the Knot
      plus some background on its creator, the late Alexander Bogomolny
08. Lots of fascinating pop-maths at Mathematical Tinkering
09. Fourteen years worth of Christmas Maths Puzzles
      from the late (and definitely great) Mark Chadwick
10. The Mathematical Medley magazine for Schools and Colleges
      Produced by Signapore University with old issues (1973-2014) online
11. The M500 Mathematics Society of The Open University 
      Informal, open to all, Undergraduate Level, old issues (up to 2021) online
12. IMO: International Mathematical Olympiad Book List
13. Wikipedia's dynamic list of unsolved problems in mathematics
14. Great Numberphile Video featuring Neil Sloane's Toothpick Patterns
15. The oldest school maths competition in the UK (papers free to download)
For All Things Fibonacci
16. Dr Ron Knott's Golden Ratio website
GCSE, A-Level and Further A-Level Teaching and Learning
17. Number Wonder's Resources for Year 9, GCSE, A-Level Pure, A-Level Statistics, A-Level Mechanics
18. Underground Mathematics A lovely presentation of A-Level topics; lots to explore
19. Corbett Maths Superb teaching materials, especially for lower ability pupils
20. Revision Maths Handy source of past GCSE papers, but lots more too.
21. Tutor Chase Handy source of past A-Level papers, but lots more too.
22. Madas Maths Great teaching resources by the late Trifon Madas 
23. Exam Solutions : Excellent GCSE, A-Level and Further A-Level Resources
24. Save My Exams : Source of A-Level, GCSE and IGCSE Revision Notes, Examples and Exercises 
25. OCR A-Level Further Maths Past Papers
26. A-Level Maths Revision from Maths Made Easy
27. Paul's Online Notes on Calculus and Differential Equations
      (Paul Dawkins teaches at Lanmar University, Texas) 
28. Differential equation slope field plotter using GeoGebra
29. Dr. R. L. Herman's A First Course in Differential Equations for Scientists and Engineers
      (An online book published in 2018 packed full of useful material)
30. 2nd Order differential equations + more from Whitman College
31. Maths videos galore from Wrath of Math (YouTube)
32. Math Bits Notebook : American High School Math
Software (free) to Plot Graphs and Transformations
33. Interactive online duel bar graph from your data
      (I use this with Year 10 GCSE pupils; fun activity)
34. Excellent visualisation applet to show 3 x 3 matrix transformations
35. Online 3D graph plotter : Show three planes in a sheaf, prism or meeting at a point
36. Another useful 3D graph plotter : Good for getting a good perspective on a single surface
37. Wolfram Alpha : Free online mathematics computations
    Example of a Parametric Plot
    Example of a Polar Plot
    Example of finding asymptotes
38. French website; Encyclopedia of (graphs) curves
   (Use google translate to read it in English, if necessary)
Fractals
39. Fractal Online Tools with Cantor Dust, as a 'getting started' example.
40. Fractal Grower by Joel Castellanos
    Software to plot fractals.
41. Fractals listed by Hausdorff dimension from Wikipedia
General Resources (University Level)
42. Several useful algorithms discussed at Mosi's Maths
     (Such as solving a cubic)
43. Robin Chapman's Home Page : Treasure trove of maths resources and undergraduate teaching
44. Gresham College Online Mathematics Lectures
45. Math Stack Exchange : Ask, answer and explore university undergraduate level problems in mathematics
46. Online free access to the London Mathematical Society Newsletters
47. Journal of Mathematics and the Arts : Many Open Access articles
48. Maths, physics and philosophy blog: The n-Category Cafe
49. Oxford University Maths news, club, case studies etc  
50. Mathematics Blog Never Ending Books
51. A group blog on the smallest field F un Mathematics
52. The Riemann Hypothesis Explained : Lovely tour of key steps leading to Riemann's famous Hypothesis
53. Employment opportunities mostly in University Mathematics Departments (worldwide) 
Combinatorics (University Level)
54. Online textbook:
     Discrete Mathematics An Open Introduction by Oscar Levin
Matrices (University Level)
55. The Number Wonder Undergraduate Lectures (First Year)
     Matrix Transformations
     Matrix Systems of Equations
     Matrix Algebra
56. Invariant lines for a 2x2 matrix using GeoGebra
57. Online calculator of Matrix Characteristic Polynomials
58. Online calculator of Eigenvectors
      (Also rank, diagonalization, Schur decomposition, Jordan normal form...)
59. Online matrix manipulations from Wolfram Alpha
60. Online Textbook: Interactive Linear Algebra
61. Solutions to the textbook Linear Algebra Done Right
Graph Theory (University Level)
62. The Number Wonder Undergraduate Lectures (Third Year)
     Graph Theory I
63. Online textbook:
      An Introduction to Algebraic Graph Theory by Cesar Aguilar
64. Online manipulation: Polyhedral viewer
65. Paper models: Polyhedral nets as PDFs
66. An accessible proof of Euler's polyhedral formula
67. Online database of small simple graphs
68. Information System on Graph Classes and their Inclusions 
69. New website for Graph Theorists House of Graphs
70. Some Graph Catalogues
71. Tables of found Regular Graphs (Markus Meringer)
72. A repository of Combinatorial Data including many graphs
73. Mathematical algorithms with code: Baeldung on CS
      For example, Induced Subgraphs
74. Gordon Royal's talk on Real Chromatic Roots of Graphs
75. Graph Theory Teaching Notes (2011) from Prof Ilesanmi Adeboye
      (He's now (2023) at Wesleyan University, Connecticut USA)
Group Theory (University Level)
76. The Number Wonder Undergraduate Lectures (First Year)
     Group Theory I
     Group Theory II 
77. Group, Ring, Field, Galois and Module Theory
      plus Linear Algebra Problems in Mathematics
78. Group Explorer Free online Software for teaching and learning Group Theory
      Group Explorer User Guide
Elliptic Curves
79. Teaching Resources for Andrew Sutherlands course at MIT, USA
80. A database of 3,824,372 Elliptic Curves and counting
Aperiodic Tilings and Symbolic Dynamics (University Level)
81. Bielefeld University's Tilings Encyclopedia
      Especially the Ammann Beenker tiling
82. Widget for exploring Aperiodic Cut and Project
83. Applet for exploring Aperiodic Cut and Project
84. Jarkko Kari's undergraduate course on Tilings and Patterns
85. Online Tilings Encyclopedia
86. A large collection of Maths Counterexamples
87. A series of YouTube videos on Ramsey Theory by Kaj Hansen
88. David Darling's website on Aperiodic Tilings
     Plus his YouTube video on the subject
89. Fun tessellations with Wang Tiles
90. YouTube The Mathematics of Lattices
91. Combinatorics on words seminar
92. The Gap System for Computational Discrete Algebra: Home Page
93. Birmingham University's Topology and Dynamics Seminars
94. Professor Donu Arapura's home page, Perdue University, Indiana, USA
     (Algebraic Geometry, eg Elliptic Curves in a nutshell)
Real Analysis
95. Teaching Resources for Claude Warnick's course at Cambridge University, UK
Analytic Number Theory
96. Teaching Resources for Noam D. Elkies' course at Harvard University, USA
Websites and Blogs by Mathematicians
97. AT Professor Evan Dummit's resources, Northeastern University, Boston, Massachusett, USA
     (Elliptic Curves, eg Integral Points on Elliptic Curves)
98. The Blog Climbing Mount Bourbaki, by Akhil Mathew at Harvard
99. Website of Professor Harold P. Boas who gained his PhD in 1980 from MIT
100. Lovely maths blog from Tanya Khovanova's at MIT
101. Homepage of Chris Eppolito Dr Chris Eppololito who gained his PhD in 2022
102. Homepage of French mathematician Emeritus Professor Jean Berstel (University of Paris-Est)
103. Homepage of German mathematician Dr Dirk Frettloh (University of Bielefeld)
104. Kennesaw mathematician Prof Misha Lavrov (Graph Theorist)
     Often active on Math Stack Exchange
105. Warwick mathematician Dr Martin Winter (Graph Theorist)
106. Website of Professor Nicholas J. Higham
      (Applied Mathematics, Numerical Linear Algebra and Software)
107. Homepage of Prof Geon Ho Choe
      (News of his 2022 Korean Mathematical Society Education Award)
108. Blog of Professor Attila Egri-Nagy
      (University profile Professor Attila Egri-Nagy)
109. Blog of Professor Timothy Gowers
      (Wikipedia on Professor Timothy Gowers)
110. Blog of Professor Terry Tao
      (Wikipedia on Professor Terry Tao)
111. Blog of Professor Greta Panova
      (Wikipedia on Professor Greta Panova)
112. Timo Jolivet's Research Page
113. Homepage of Prof Steven J. Miller
114. Homepage of Prof Narad Rampersad
115. Homepage of Prof Lieven le Bruyn
116. Website of Prof Jeffrey O. Shallit
      Plus a directory of his talks
117. Homepage of (the late) Professor Uwe Grimm of the Open University
118. Homepage of Dr John Magorrian (Oxford, UK)
119. Home page of Dr Dainis Zeps (Latvian University)
      especially his index of web pages
120. Home page of Professor Emeritus William G Faris (University of Arizona)
121. Homepage of Prof Vadim Ponomarenko (University of San Diago)
      (His Mathematical Gazette articles are included)
122. Minimalist homepage of Prof Chris Smyth (The University of Edinburgh)
      (Lots on Salem Numbers and Pisot Numbers)
123. Homepage of Prof James McKee (Royal Holloway University of London)
      (Lots on Salem Numbers and Pisot Numbers)
124. Homepage of Prof Howard E Haber (University of California, Santa Cruz, USA)
      (A Physicist !)
125. Homepage of Prof Lenya Ryzhik (Stanford University)
      Lots of lecture notes
126. Homepage of Dr Felix Flicker (University of Cardiff)
      Physicist with aperiodic leanings
127. Homepage of Dr Dan Rust (The Open University)
      For all things Aperiodic
128. Homepage of Dr. Veselin Jungic (Rice University)
      Author of Basics of Ramsey Theory
129. Homepage of Prof Anthony Várilly-Alvarado (Rice University)
      For all things on Surfaces
130. Homepage of Prof Jörn Dunkel (MIT)
      Lecture Notes on Complex Analysis, for example
131. Homepage of Prof Alan Haynes (University of Houston)
      Great notes on Aperiodic Cut and Project
 

 
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