The corpus, every claim citable.

The decimal place-value system originated in India and spread in documented stages: epigraphic evidence (including a 605 CE Cambodian inscription) shows coverage "roughly of the size of Europe" by the end of the 6th century; Arab mathematicians adopted it in the 8th century; common European use came only around the 16th — popular almanacs of 1557–96 still print Roman numerals. Datta & Singh (1938) document each stage from primary evidence.

History of Hindu Mathematics — A Source Book · 1938