Jeeagh er bun Straih Fibonacci

[[File:FibonacciBlocks.svg|thumb|180px|right|Leacan jeant jeh kerrinyn, as ya lhiurid ny çheuyn oc rere ny h-earrooyn Fibonacci]]
[[File:Fibonacci spiral 34.svg|right|thumb|180px|[[Caslagh Fibonacci]] jeant liorish kerrinyn ayns leacan Fibonacci, as cruillagyn jeant eddyr ny corneilyn oc.  Ta'n fer shoh jeant jeh kerrinyn 1, 1, 2, 3, 5, 8, 13, 21, as 34 er lhiurid.]]

Ayns [[maddaght]], ta ny '''earrooyn Fibonacci''' ny '''straih Fibonacci''' çheet er earrooyn yn 'traih shoh:
:<math>0,\;1,\;1,\;2,\;3,\;5,\;8,\;13,\;21,\;34,\;55,\;89,\;144,\; \ldots.</math>
Rere meenaghey, she 0 as 1 ad y chied daa earroo Fibonacci, as ta dagh earroo ny yei ny sym y daa roish.  Ny keayrtyn, t'ad faagail magh y 0 as goaill toshiaght lesh 1, 1.

Rere maddaght, ta'n straih ''F''<sub>''n''</sub> dy earrooyn Fibonacci rere'n [[cochiangley aahaghyrtagh]]
:<math>F_n = F_{n-1} + F_{n-2},\!\,</math>
as ny earrooyn toshee heese echey
:<math>F_0 = 0 \quad\text{and}\quad F_1 = 1.</math>

Ta ennym yn 'traih çheet er [[Leonardo jeh Pisa]].  V'ad cur ''Fibonacci'' er (girraghey er son ''filius Bonaccio'', "mac Vonaccio"). Ren y lioar 1202 echey, ''[[Liber Abaci]]'', cur stiagh y striah dys maddaght ny h-Oarpey Heear.  V'eh mie er fys ayns [[maddaght Injinagh]] hannah.<ref>{{enmysearishlioar
  | screeudeyr = Parmanand Singh
  | ennym = Acharya Hemachandra and the (so called) Fibonacci Numbers
  | earishlioar = Math. Ed. Siwan
  | ym-lioar = 20
  | earroo = 1
  | duillag = 28-30
  | blein = 1986
  | issn = 0047-6269}}</ref><ref>{{enmysearishlioar
  | screeudeyr = Parmanand Singh
  | ennym = The So-called Fibonacci numbers in ancient and medieval India
  | earishlioar = Historia Mathematica
  | ym-lioar = 12
  | earroo = 3
  | duillag = 229–44
  | blein = 1985
}}</ref>

==Imraaghyn==
{{rolleyimraaghyn}}

[[Ronney:Straih Fibonacci| ]]

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