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This collection of notes is part of [1].
https://en.wikipedia.org/wiki/Post-classical_history#Timeline
The positional base-10 https://en.wikipedia.org/wiki/Hindu%E2%80%93Arabic_numeral_system "was invented between the 1st and 4th centuries by Hindu mathematicians. The system was adopted, by Persian mathematicians (Al-Khwarizmi's c. 825 book On the Calculation with Hindu Numerals) and Arab mathematicians (Al-Kindi's c. 830 volumes On the Use of the Hindu Numerals) by the 9th century. It later spread to the western world by the High Middle Ages."
