## Four bottles - Equidistant mouth problems

How to place four identical bottles in the plane such that the distance between each pair of mouths will be the same?

## Four bottles - Equidistant mouth problems

How to place four identical bottles in the plane such that the distance between each pair of mouths will be the same?## Fibonacci Sequence, A Pattern of Natural Beauty

The sequence of Fibonacci can be found everywhere in nature. In this post introduce some of its fundamental properties...## List of Computer tools in mathematics

The following list links to free computer tools for mathematics.## Free Textbooks in Mathematics

The following is a list of links to useful textbooks in mathematics, available for free on the Internet. All books are legally safe to download, The books are in printable format - Postscript (PS) or Portable Document Format (PDF). You are free to download, read and print them. This is a partial list of "free textbooks" in math, the list is to be updated regularly.## The circle of Apollonius

By definition, a circle is the locus of all points equidistant from a fixed center. However, the circle of Apollonius is defined differently. In the following post I will define and construct an Apollonian circle.## How many squares can be found here?