Any non-Indian sources to corroborate that? My experience in college, trying to figure out how math ideas from the Indian subcontinent and from around Mediterr

Any non-Indian sources to corroborate that? My experience in college, trying to figure out how math ideas from the Indian subcontinent and from around Mediterranean fit together was that the only claims for ancient Hindu rigorous math were from Indian sources and they were pretty hand-wavy about rigor. It reminded me of (a geographically, temporally translated) Tom Lehrer's "Lobachevsky." https://www.youtube.com/watch?v=UQHaGhC7C2E https://www.youtube.com/watch?v=UQHaGhC7C2E