- Pi2010/03/14
Pi, the most famous mathematical constant.

- Proof2008/07/02
Mathematician Bernhard Riemann explains the importance of proofs in mathematics. He proves a theorem on stereographic projection.

- Fibration continued2008/07/02
The mathematician Heinz Hopf describes his "fibration". Using complex numbers he builds beautiful arrangements of circles in space.

- Fibration2008/07/01

The mathematician Heinz Hopf describes his "fibration". Using complex numbers he builds beautiful arrangements of circles in space.

- Complex Numbers continued2008/06/30
Mathematician Adrien Douady explains complex numbers. The square root of negative numbers is explained in simple terms. Transforming the plane, deforming pictures, creating fractal images.

- Complex Numbers2008/06/29
Mathematician Adrien Douady explains complex numbers. The square root of negative numbers is explained in simple terms. Transforming the plane, deforming pictures, creating fractal images.

- The fourth dimension continued2008/06/28
Mathematician Ludwig Schläfli talks to us about objects in the fourth dimension and shows us a procession of regular polyhedra in dimension 4, strange objects with 24, 120 and even 600 faces!

- The fourth dimension2008/06/27
Mathematician Ludwig Schläfli talks to us about objects in the fourth dimension and shows us a procession of regular polyhedra in dimension 4, strange objects with 24, 120 and even 600 faces!

- Dimension three2008/06/26
M. C. Escher tells the adventures of two-dimensional creatures who are trying to imagine three-dimensional objects.?

- Dimension 22008/06/25
Hipparchus explains how two numbers can describe the position of a point on a sphere. He then explains stereographic projection: how can one draw a picture of the Earth on a piece of paper?

- Are you having Phun yet?2008/06/14
Introduction to Phun. The new entertaining and extreme fun eductional computer program. Using Phun to explain Math.

- Weaving Numbers2007/03/18
Vedic multiplication or weaving multiplication. Fibonacci's Sieve or Lattice Multiplication. John Napier's Bones multiplication.

- The Well Ordering Principle2007/02/26
Proving The Well Ordering Principle is equivalent to The Principle of Mathematical Induction.

- Mathematical Induction (Part III)2007/02/19
Principle of Strong Mathematical Induction. Fermat's Method of infinite descent. Well Ordering Principle.

- Mathematical Induction (Part II)2007/02/11
Prove Inequality using the Method of Mathematical Induction.

- 1, 2, 3 ... Infinity. Mathematical Induction2006/10/16
Explain the Method of Mathematical Induction. Francesco Maurolico, Pascal and John Wallis. Applying the method of Induction to prove the sum of odd numbers is a square.

- Summation Telescoping Property2006/10/09
We explain the summation telescoping property and apply it to finding two summations.

- It's all Greek to me! Sigma notation2006/10/01
Sigma Notation. Tetrahedral numbers. Pyramidal Numbers. Some relations between them.

- Triangular Numbers (Part III)2006/09/24
Recursive Relation for triangular numbers. Finding a solution to the recursive equation and another solution to the Recursive equation.

- Triangular Numbers (Part II)2006/09/17
Using Gauss Idea to find the sum 1+2 + ... +n. Arithmetic progressions an obtaining a general formula for the sum of an arithmetic progression.

- Triangular Numbers (Part I)2006/07/26
Elementary explanation of triangular numbers and Gauss demonstration for the sum of the first 100 natural numbers.