Online Reference
- Discrete Mathematics - An Open Introduction
- by Oscar Levin; 3rd Edition
- Math Symbols
- Math Symbols Explained with Python
- Paul's Online Math Notes
- TVMCalcs.com
- Wikimedia: Displaying a Formula
- TeX, LaTeX and AMS-LaTeX
- Visualizations of Mathematical Functions
- Wolfram Research
- Wolfram Functions Site
- Wolfram MathWorld
Articles
- Art & Spirit in Mathematics: The Lessons of Japanese Temple Geometry
- A Comparison of Techniques for Introducing Material Implication
- Babylon and the Square Root of 2 | Azimuth
- Decades-Old Computer Science Conjecture Solved in Two Pages
- by Erica Klarreich; Quanta Magazine, Jul. 25, 2019
- Doing Mathematics Differently
- by Gregory Chaitin
- George Boole and the Calculus of Thought
- by Richard Passov; 3 Quarks Daily, Feb. 28, 2018
- Gödel and the Nature of Mathematical Truth II
- A Talk with Verena Huber-Dyson; Edge, Jul. 27, 2005
- Gödel and the Nature of Mathematical Truth
- A Talk with Rebecca Goldstein; Edge, Jun. 8, 2005
- How to play mathematics
- by Margaret Wertheim; Aeon, Feb. 7, 2017
- Intuitive Understanding of Euler’s Formula
- Better Explained
- Kenneth Appel Obituary; New York Times
- Kenneth Ira Appel: American Mathematician
- Encyclopedia Britannica
- Kurt Gödel and the romance of logic
- by Ray Monk; Prospect Magazine, Dec. 13, 2018
- Mathematicians Discover the Perfect Way to Multiply
- by Kevin Hartnett; Quanta Magazine, Apr. 11, 2019
- The Nature of Infinity, and Beyond – Cantor’s Paradise
- by Jørgen Veisdal; Medium, Dec. 17, 2018
- Pell numbers
- Wikipedia
- Revolutionary New Sudoku Techniques
- Desystemize; Mar. 30, 2022
- Should Alice Marry Bob?
- by Timothy Gowers; The Spectator, Nov. 3, 2012
Books
- The Art of Insight in Science and Engineering: Mastering Complexity
- by Sanjoy Mahajan; MIT Press, 2014
- Book of Proof
- by Richard Hammack; Virginia Commonwealth University, 2013
- Category Theory for the Sciences
- by David I. Spivak; MIT Press, 2014
- Free Math Resources | Real Not Complex
- Textbooks, Lectures Notes, Videos and Online Courses
- Free and Open-Source Textbooks
- Dana C. Ernst
- Mathematics for the adventurous self-learner
- Neil Sainsbury
- Online Mathematics Textbooks
- Georgia Tech
- Statistics Done Wrong
- Online book by Alex Reinhart
- Street-Fighting Mathematics
- by Sanjoy Mahajan; MIT Press, 2010
LaTeX
- Introduction to LaTeX
- University of Illinois
- LaTeX Cheat Sheet
- Math into LaTeX, Chapter 1
- mathURL: Live Equation Editing
- Online LaTeX Equation Editor
Miscellaneous
- Clay Mathematics Institute
- Desmos Calculator
- Folding Fractions
- Gowers's Weblog
- Kirby Urner
- Kurt Gödel Bio
- Learn Difficult Concepts with the ADEPT Method
- Linear Algebra Guide *
- Mathematical Enchantments
- Blog by James Propp
- The Number Spiral
- Pictures from the OEIS
- Online Encyclopedia of Integer Sequences
- Prof. Keith Devlin
- SAGE: Open Source Mathematics Software
- Tricki
- Repository of mathematical know-how
Number Theory
Organizations
- American Institute of Mathematics
- American Mathematical Society
- Mathematical Association of America (MAA)
Probability & Statistics
- Distributions: Moments of the Mean
- YouTube
- Introductions to Statistics
- Udacity course
- NASA: Introduction to Statistics
- Statistics Tutorial
- Think Stats: Probability & Statistics for Programmers