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 :

assaɣ a/b yegda-d amḍan n wuṛeɣ $\varphi$ (phi)

${\frac {a+b}{a}}={\frac {a}{b}}$ akked ${\frac {a}{b}}=\varphi$

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