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en.wikipedia.org/wiki/Fibonacci

The solution, generation by generation, was a sequence of numbers later known as Fibonacci numbers. Although Fibonacci's Liber Abaci contains the earliest known description of the sequence outside of India, the sequence had been described by Indian mathematicians as early as the sixth century.

en.wikipedia.org/wiki/Fibonacci_number

Fibonacci numbers are strongly related to the golden ratio: Binet's formula expresses the n th Fibonacci number in terms of n and the golden ratio, and implies that the ratio of two consecutive Fibonacci numbers tends to the golden ratio as n increases. Fibonacci numbers are named after Italian mathematician Leonardo of Pisa, later known as ...

plus.maths.org/content/life-and-numbers-fibonacci

Fibonacci numbers also appear in plants and flowers. Some plants branch in such a way that they always have a Fibonacci number of growing points. Flowers often have a Fibonacci number of petals, daisies can have 34, 55 or even as many as 89 petals! A particularly beautiful appearance of fibonacci numbers is in the spirals of seeds in a seed head.

www.britannica.com/biography/Fibonacci

…by the medieval Italian mathematician Leonardo Pisano (“Fibonacci”) in his Liber abaci (1202; “Book of the Abacus”), which also popularized Hindu-Arabic numerals and the decimal number system in Europe. For information on the interesting properties and uses of the Fibonacci numbers see number games: Fibonacci numbers.…

www.leonardofibonacci.org

A tiling with squares whose side lengths are successive Fibonacci numbers. In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones.

www.goldennumber.net/fibonacci-series

Fibonacci number patterns do appear in nature, but be careful in using them as an explanation. Most curves and spirals in nature, particularly in non-living examples, are simply equiangular / logarhymic curves, which expand at an equal pace throughout the curve and have nothing to do with Fibonacci numbers or the golden ratio.

www.thoughtco.com/leonardo-pisano-fibonacci-biography-2312397

Leonardo Pisano Fibonacci (1170–1240 or 1250) was an Italian number theorist. He introduced the world to such wide-ranging mathematical concepts as what is now known as the Arabic numbering system, the concept of square roots, number sequencing, and even math word problems.

corporatefinanceinstitute.com/.../fibonacci-numbers

Fibonacci Numbers are the numbers found in an integer sequence discovered/created by mathematician, Leonardo Fibonacci. The sequence is a series of numbers characterized by the fact that every number is the sum of the two numbers preceding it.

www.livescience.com/37470-fibonacci-sequence.html

The Fibonacci sequence is one of the most famous formulas in mathematics. Each number in the sequence is the sum of the two numbers that precede it.

www.mathsisfun.com/numbers/fibonacci-sequence

It takes longer to get good values, but it shows that not just the Fibonacci Sequence can do this! Using The Golden Ratio to Calculate Fibonacci Numbers. And even more surprising is that we can calculate any Fibonacci Number using the Golden Ratio: The answer always comes out as a whole number, exactly equal to the addition of the previous two ...

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