# Some interesting pieces of mathematical information

Here are a few interesting pieces of mathematical information:

- The number zero was not always considered a number in its own right. In many ancient cultures, including the Greek and Roman empires, the concept of “nothingness” was not represented by a numerical symbol. It was not until the Indian mathematician Brahmagupta in the 7th century that zero was recognized as a number.
- The number π (pi) is a mathematical constant that represents the ratio of the circumference of a circle to its diameter. It is approximately equal to 3.14159, but it is actually an irrational number that continues indefinitely without repeating.
- The Fibonacci sequence is a series of numbers in which each number is the sum of the previous two numbers. The sequence begins with 0 and 1, and continues as follows: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, etc. This sequence appears in many natural phenomena, such as the arrangement of leaves on a stem and the branching of trees.
- The Mandelbrot set is a mathematical object that is created by iteratively applying a simple equation to complex numbers. The resulting set of numbers is plotted on a complex plane, and the resulting image is a fractal that exhibits self-similarity and infinite detail.
- In the mathematical field of topology, a donut and a coffee cup are considered to be the same shape, because they can