« In A sense, Khwarizmi kan zijn more entitled to be called « the father of algebra » than Diophantus because Khwarizmi kan zijn the first to teach algebra in an elementary form and for its own sake, Diophantus kan zijn primarily concerned with the theory of numbers. » ↑ http://www.drugoffice.gov.hk/gb/unigb/nl.wikipedia.org/wiki/Kwaliteit