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Similarly, the fact that several commentaries on the Aryabhatiya have come from Kerala has been used to suggest that it was Aryabhata's main place of life and activity; however, many commentaries have come from outside Kerala, and the Aryasiddhanta was completely unknown in Kerala.
A verse mentions that Aryabhata was the head of an institution (kulapa) at Kusumapura, and, because the university of Nalanda was in Pataliputra at the time and had an astronomical observatory, it is speculated that Aryabhata might have been the head of the Nalanda university as well.
Direct details of Aryabhata's work are known only from the Aryabhatiya.
The name "Aryabhatiya" is due to later commentators. His disciple Bhaskara I calls it Ashmakatantra (or the treatise from the Ashmaka).
The place-value system, first seen in the 3rd-century Bakhshali Manuscript, was clearly in place in his work.
His major work, Aryabhatiya, a compendium of mathematics and astronomy, was extensively referred to in the Indian mathematical literature and has survived to modern times.
It is also occasionally referred to as Arya-shatas-a Sh Ta (literally, Aryabhata's 108), because there are 108 verses in the text.