The Kerala School of Astronomy and Mathematics refers to a tradition of mathematicians and astronomers active in the Malabar region of southern India from roughly the 14th century to the 16th century, and continuing in diminished form into the 18th century. The school is associated with figures including Madhava of Sangamagrama (c. 1340-c. 1425), considered its founder, along with later scholars such as Parameshvara, Nilakantha Somayaji, and Jyeshthadeva. 1) Its work spans astronomical observation and calendrical calculation as well as mathematical results, including infinite series expansions for trigonometric functions that anticipate methods later associated with calculus in Europe. 2) The extent to which the school's mathematical achievements should be compared to, or considered precursors of, later European developments is a matter of ongoing discussion among historians of science; see kerala-school-european-priority-viewpoint and related pages below.
Primary texts attributed to the school, such as Nilakantha's *Tantrasangraha* (c. 1501) and the *Yuktibhasa* (c. 1530, attributed to Jyeshthadeva), contain derivations of infinite series for sine, cosine, and arctangent, along with a value of pi computed via series expansion. 3) These results were documented in Sanskrit and Malayalam and were preserved within a regional tradition of astronomical scholarship tied to temple and court patronage. Scholars generally agree on the mathematical content of these texts and on the approximate dates of the principal authors. Disagreement centers less on what the texts contain than on how to characterize their significance: whether the series results constitute an early form of calculus, whether they were arrived at by methods analogous to those of Newton and Leibniz, and whether knowledge of these results could have reached Europe before the independent European development of calculus in the 17th century. 4) The transmission question is addressed in more detail at Kerala School History.
This is also related to the broader question of how scientific credit is assigned across cultures and eras; see Newton Scientific Credit - Newton Viewpoint.
1. Kim Plofker, *Mathematics in India* (Princeton: Princeton University Press, 2009), 217-53. 2. George Gheverghese Joseph, *The Crest of the Peacock: Non-European Roots of Mathematics*, 3rd ed. (Princeton: Princeton University Press, 2011), 408-25. 3. C. K. Raju, *Cultural Foundations of Mathematics* (New Delhi: Pearson Longman, 2007), 109-25. 4. David Bressoud, "Was Calculus Invented in India?," *The College Mathematics Journal* 33, no. 1 (2002): 2-13.