450 bcStones, pebbles?, are introduced by the Greek as counting aids and will return in this form as a means to count similar to an Abacus (around 50 bc) in the Roman Empire. From there this Abacus spreads through Europe. In Western Europe these counting boards stay in use for a pretty long time but gradually one starts to use the indoArabic notation of numbers: "0123456789". (+/ 1200) 
ca.800Muhammed
idn Musa AlKhwarizmi was born in 780 A.D. and died in 850 A.D.
He was an Arabic mathematician who introduced the Hindu decimal system
and the use of zero into Arabic mathematics. He also extended the work
of Diophantis on algebraic equations in a book, the title which included
the word aljabr (transposition) from which the modern word algebra
is derived. (ref. Jennifer, 1996)
