Premise: Jyestadeva (1500-1610), was an astronomer of the Kerala school founded by Madhava of Sangamagrama and a student of Damodara. He is most known for writing the first calculus text, the Yuktibhasa . He also authored the Drk-karana on astronomical observations.
Hypothesis: Jyestadeva is most known for writing the first calculus text, the Yuktibhasa.