Soo saar nooc ka mid ah jumladdan oo aad u adag. Number theory (ama arithmetic Gaar ahaan ilaha hore; eeg laba qoraal ee soo socda.) waa laan ka mid ah xisaabta saafi ah ugu horeyn u huray in ay daraasadda ee abyoonaha.
Dabcan, nooc ka sii adag jumlada waa "Aragtida tirada (ama xisaabta gaar ahaan ilaha hore; fiiri laba qoraal ee soo socda.) waa laan ka mid ah xisaabta saafiga ah oo ugu horrayn loogu talagalay daraasadda nambarada saafiga ah, mararka qaarkood loo yaqaan'' Boqoradda Xisaabta'sababtoo ah booska aasaasiga ah ee anshaxa. "