Mathematician:Aryabhata the Elder
Indian mathematician and astronomer.
An early believer in the irrationality of $\pi$, and developed an approximation for it of $3.1416$.
- Born: 476, Kusumapura (now Patna), India
- Died: 550, India
- Sine, cosine and versine, under the names jyā, koti-jyā and utkrama-jyā.
- Area of Triangle in Terms of Side and Altitude
- Aryabhata Algorithm
- Aryabhata Numeration
- 499: Aryabhatiya (or Ashmakatantra, as it is referred to by Bhaskara I in his commentary Aryabhatiyabhasya)
- Several more lost treatises on mathematics and astronomy
Also known as
The name can also be rendered Āryabhaṭa.
Aryabhata the Elder is also referred to as Aryabhata $\text I$ to distinguish him from Aryabhata II who lived some $400$ years later.
- John J. O'Connor and Edmund F. Robertson: "Aryabhata the Elder": MacTutor History of Mathematics archive
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): Entry: Aryabhata (c.475-c.550)
- 2008: Ian Stewart: Taming the Infinite ... (previous) ... (next): Chapter $3$: Notations and Numbers: Brahmagupta, Mahavira and Bhaskara
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Entry: Āryabhata (about 476-550)