@ARTICLE {, title = {Poznámka k zavedeniu komplexných čísel}, author = {Lihosithová, Mária}, journal = {Obzory matematiky, fyziky a informatiky}, year = {2011}, volume = {40}, number = {4}, pages = {25--28}, issn = {1335-4981}, abstract = {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.}, }