1857) 1915 - William Willett, inventor of Daylight Saving Time (b.. 
Ninu imo iṣiro gbongbo Alágbárameji tabi gbongbo ilọpomeji (square root) fun nọmba x jẹ nọmba r ti yio jẹ  tabi pe nọmba r ti alagbara rẹ (ti a ba sọ di pupọ pẹlu ara rẹ) jẹ x.Mathikimatiki.. 