Assertion: arabic numeral | /r/HasProperty | the basis of all calculations
Facets:
value: since 820 ad
type: TEMPORAL
Source sentences:
text: ' Arabic numerals ' are the basis of all calculations, ever since 820 AD when the Persian scholar Al-Khwarizmi popularized it through the Middle East and Europe with his book 'On the Calculation with Hindu Numerals', suggesting its Indian origin.