Fibonacci - Mathematician of the Middle Ages. (1170 - 1240-1250)

Leonardo Pisano Bigollo, also known as Leonardo of Pisa, or simply Fibonacci, (“Filius Bonacci - the son of ”Bonacci") was not the first to think of the sequence and pattern of counting made up of numbers that sum the previous two numbers before them — 1, 1, 2, 3, 5, 8, 13 — and so on. But he was the first to bring it to the European world and bring awareness to its importance in the furthering of science.  The sequence is now used in computing, stock trading, architecture and design. In 1202, Fibonacci published “Liber Abaci” (The Book of Calculation) introducing Europe not only to his now-famous sequence but also to the Hindu-Arabic base 10, numeral system, which by the 15th century replaced the Roman numeral system, revolutionized math, and is in use today in most of the world although some countries still rely on their traditional numeral system for specific purposes.

The sequence itself first appeared in Indian Mathematics, known as Virahanka numbers, and was connected with Sanskrit prosody. The number sequence is also tied to the golden ratio and the golden triangle, both of which appear again and again in nature, as does the sequence itself. It is in the most fundamental of things, from the petals of the yellow chamomile to the complex and seemingly random branching of a tree’s limbs. These are just a few. The Fibonacci sequence is everywhere. Video

November 23 is the date chosen by some to celebrate as Fibonacci day, because when the date is written in the mm/dd format (11/23), the digits forms a Fibonacci sequence: 1,1,2,3. Fibonacci was a very important mathematician and that date may remind us to take the opportunity to marvel at the way math pervades everything around us. The Fibonacci sequence can be used to calculate the proportions of countless things on Earth and beyond, such as animals, plants, weather patterns, and even galaxies. Pause to observe your surroundings and you’ll start to notice the familiar spiral all around you. Leonardo Bonacci was born to an Italian merchant and customs official working in in North Africa, modern-day Algeria, It was there when living with his father, that Fibonacci learned Hindu-Arabic numerals. It is believed that Fibonacci died sometime between 1240 and 1250 in Pisa, Italy. More

Note: Fibonacci' Liber abaci book, contains the respectful quote: "If by chance I have omitted anything more or less proper or necessary, I beg forgiveness, since there is no one who is without fault and circumspect in all matters".