Answer:
At his death eleven years later, Alexander ruled the largest empire of the ancient world. His victory at the battle of Gaugamela on the Persian plains was a decisive conquest that insured the defeat of his Persian rival King Darius III.
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He believed that the Arabic Numeral System was more efficient than the Roman Numeral System.
He also believed that his system, named the Fibonacci Sequence, occurred throughout nature in processes like evolution and even the distances of the planets from the sun (which is crazy). There's still debate on whether it really applies or not, but the number of things things people have found that do work is immense.
