Hi Mark,

In addition to the other suggestions, you might read:

These contain references to David Pingree’s foundational work on Indian mathematics. 

Jonathan Edelmann

Assistant Professor of Hinduism
University of Florida
Department of Religion

On Sep 2, 2015, at 9:16 PM, Dominik Wujastyk <wujastyk@gmail.com> wrote:

For primary sources, I've always thought
Rangācārya, M. (Ed.) The Gaṇita-sāra-sangraha of Mahāvīrācārya with English Translation and Notes Madras Govt. Press, 1912,
to be a brilliantly clear exposition of medieval Indian mathematics. 

For a general introduction and orientation, with up-to-date notes and bibliography for further reading, we now have
Plofker, K. Mathematics in India Princeton University Press, 2009.

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