Yuktibhāṣā
Yuktibhāṣā (Malayalam: യുക്തിഭാഷ, lit. 'Rationale'), also known as Gaṇita-yukti-bhāṣā and Gaṇitanyāyasaṅgraha (English: Compendium of Astronomical Rationale), is a treatise on mathematics and astronomy, written by the Indian astronomer Jyeṣṭhadeva of the Kerala school of mathematics around 1530. The treatise, written in Malayalam, is a consolidation of the discoveries by Madhava of Sangamagrama, Nilakantha Somayaji, Parameshvara Nambudiri, Jyeṣṭhadeva, Achyuta Piṣāraṭi, and other astronomer-mathematicians of the Kerala school.