TY - JOUR T1 - Poznámka k zavedeniu komplexných čísel A1 - Lihosithová, Mária JA - Obzory matematiky, fyziky a informatiky Y1 - 2011 VL - 40 IS - 4 SP - 25 EP - 28 SN - 1335-4981 N2 - Asimple example of a cubic equation is presented showing that the computing with the symbol Sqrt{-1} can lead to a real solution of the equation. ER -