What is "ganita-yukti-bhasa"

Ganita-yukti-bhasa (also written as Ganita Yuktibhasa) is either the title or a part of the title of three different books:

• Ganita-yukti-bhasa (Rationales in Mathematical Astronomy) of Jyesthadeva, published by Springer, is the first critical edition with an English translation of Yuktibhasa, a seminal treatise in the Malayalam language composed in c.1530 CE by Jyeshthadeva. one of the most significant personalities of the Kerala school of astronomy and mathematics. The book is published in two volumes as Volume I and Volume II. Jyeshthadeva's Yuktibhasa discusses various topics in mathematics and astronomy and it is purported to be an enunciation of the rationales underlying the various mathematical assertions and the astronomical concepts and computations in the great treatise Tantrasamgraha of Nilakantha Somayaji (1444–1544). (An edition of the mathematical portion of Yuktibhasa with some explanatory notes in Malayalam had appeared in 1948.)
• In addition to Jyshthadeva's Yuktibhasa, Kerala school of astronomy and mathematics had produced another work called Ganita Yuktibhasa. In contrast to Jyeshthadeva's Yuktibhasa, this work is in Sanskrit. The date of composition and the name of the author of this work in Sanskrit have not been determined with certainty. The book appears to be of a later period and seems to have been composed as a somewhat rough Sanskrit translation of the Malayalam original Yuktibhasa.
• Ganita Yuktibhasa (Volume III) is the title of a book published by Indian Institute of Advanced Study (IIAS), Shimla, and it is a critical edition of the Sanskrit Ganita Yuktibhasa. This is intended as the third volume of a series on Yuktibhasa, the first two volumes being Volume I and Volume II of Ganita-yukti-bhasa (Rationales in Mathematical Astronomy) of Jyeshthadeva published by Springer.