The development of mathematics was held up for a long time by the cumbersome notation of the Greeks and then the Romans. The Roman system was good for adding, subtracting and tallying, but very awkward for multiplication or division. Then came the Arabic system, with its emphasis on the position of a symbol as well as its shape. Then there was the invention of the zero, which has had an immense usefulness in the development of mathematics. The invention of the decimal notation again made things easier.