Fun arithmetic with the number nine
Fun arithmetic with the number seven.
A magic square. All rows, columns, and diagonals have the same sum.
Pi, expressed as an infinite series and an infinite product.
Pascal's triangle shows the binomial coefficients.
The quadratic equation defines a parabola
The Pythagorean theorem. A proof by rearrangement.
The trigonometric functions. Another form of the Pythagorean theorem.
Each Fibonacci number is the sum of the previous two. The number of spirals in a sunflower or a pinecone is a Fibonacci number.
Cantor's proof that the infinity of real numbers is greater than the infinity of integers.
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