Amḍan n wuṛeɣ

Amḍan n wuṛeɣ d taẓunt, tettwasbadu s tanzeggit, am wassaɣ awḥid a/b i yellan gar sin n teɣziwin a akked b am akken assaɣ n timernit a + b ɣef tinna meqqren akk (a) atili tegda ar tinna meqqren (a) ɣef tinna mecṭuḥen (b), yettwaru s tenfalit agi :

a + b a = a b {\displaystyle {\frac {a+b}{a}}={\frac {a}{b}}} akked a b = φ {\displaystyle {\frac {a}{b}}=\varphi }

Amḍan armeɣẓan-agi d tifrat tawḥidt yufraren ar tugda φ 2 = φ + 1 {\displaystyle \varphi ^{2}=\varphi +1} , yegda-d : φ = 1 + 5 2 ≈ 1,618 0339887. {\displaystyle \varphi ={\frac {1+{\sqrt {5}}}{2}}\approx 1{,}6180339887.}