

Pythagoras. ca.560ca.480 BC. Greek philosopher and mathematician.
There is geometry in the humming of the strings. There is music in the spacing of the spheres.
Geometry is knowledge of the eternally existent.
Above the cloud with its shadow is the star with its light. Above all things reverence thyself.
If there be light, then there is darkness; if cold, heat; if height, depth; if solid, fluid; if hard, soft; if rough, smooth; if calm, tempest; if prosperity, adversity; if life, death.
The oldest, shortest words  "yes' and "no"  are those which require the most thought.
The Pythagorean Theorem: A 4,000Year History

The Pythagorean Theorem: A 4,000Year History
by Eli Maor
(Hardcover)
Synopsis
By any measure, the Pythagorean theorem is the most famous statement in all of mathematics, one remembered from high school geometry class by even the most mathphobic students. Well over four hundred proofs are known to exist, including ones by a twelveyearold Einstein, a young blind girl, Leonardo da Vinci, and a future president of the United States. Hereperhaps for the first time in Englishis the full story of this famous theorem. Although attributed to Pythagoras, the theorem was known to the Babylonians more than a thousand years before him. He may have been the first to prove it, but his proofif indeed he had oneis lost to us. Euclid immortalized it as Proposition 47 in his Elements, and it is from there that it has passed down to generations of students. The theorem is central to almost every branch of science, pure or applied. It has even been proposed as a means to communicate with extraterrestrial beings, if and when we discover them. And, expanded to fourdimensional spacetime, it plays a pivotal role in Einstein's theory of relativity. In this book, Eli Maor brings to life many of the characters that played a role in the development of the Pythagorean theorem, providing a fascinating backdrop to perhaps our oldest enduring mathematical legacy. 

