- History of negative numbers
- Negative Numbers
- Proof: a brief historical survey
- A brief history of time measurement
- From a random world to a rational universe
- The four color theorem
- Geometry: History from practice to abstraction
- The development of Algebra 1
- The development of Algebra 2
- History of trigonometry Part 1
- History of trigonometry Part 2
- History of Trigonometry Part 3
- History of the Concept of Function

Harvard Course on nature of math

A Short Account of the History of Mathematics