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# Fibonacci fraction

A Fibonacci fraction is a rational number of the form $\frac{F_{n}}{F_{m}}$ where $F_{i}$ is the $i$th number of the Fibonacci sequence and $n$ and $m$ are integers in the relation $n<m$. In the Fibonacci fractional series, each $m=n+2$:

$\frac{1}{2},\frac{1}{3},\frac{2}{5},\frac{3}{8},\frac{5}{13},\frac{8}{21},% \frac{13}{34},\frac{21}{55},\frac{34}{89},\ldots$ |

The most important application of Fibonacci fractions is in botany: plants arrange the leaves on their stems (phyllotaxy) in many different ways, but “only those conforming to a Fibonacci fraction allow for efficient packing of leaf primordia on the meristem surface.” There is also an application in optics.

# References

- 1 P. A. David “Leaf Position in Ailanthus Altissima in Relation to the Fibonacci Series” American Journal of Botany 26 2 (1939): 67
- 2 R. W Pearcy & W Yang “The functional morphology of light capture and carbon gain in the Redwood forest understorey plant Adenocaulon bicolor Hook” Functional Ecology 12 4 (1998): 551
- 3 H. C. Rosu, J. P. Trevino, H. Cabrera & J. S. Murguia, “Self-image effects for diffraction and dispersion” Electromagnetic Phenomena 6 2 (2006): 204 - 211

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## Mathematics Subject Classification

11B39*no label found*

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