Prasthanatrayi (, IAST: ), literally, three sources (or axioms), refers to the three canonical texts of theology having epistemic authority, especially of the Vedanta schools. It consists of:
The Mukhya Upanishads consist of ten, twelve or thirteen major texts, with a total of 108 texts described in Muktikopanishad. The ten Upanishads are êà ÂÃÂ, Kena, Kaá¹Âha, Praá¹£na, Muá¹Âá¸Âaka, MÃÂá¹Âá¸Âà «kya, Taittirëya, Aitareya, ChÃÂndogya and Bá¹ÂhadÃÂraá¹Âyaka.
The is a part of the Bhishma Parva of the .
The also known as the ', systematize the doctrines taught in the Upanishads and the .
Founders of the major schools of Vedanta, Adi Shankara, MadhvÃÂcharya wrote (commentaries) on these texts. RÃÂmÃÂnujÃÂchÃÂrya did not write any (commentary) on the Upanishads, but wrote on Brahma Sutras also known as à Ârë BhÃÂá¹£ya and Bhagavad Gita. Even though Ramanuja did not write individual commentaries on principal Upanishads, he included many hundreds of quotations from Upanishads in his à Ârë BhÃÂá¹£ya. In the Ramanuja lineage, one of his followers, Raá¹ garÃÂmÃÂnuja, wrote commentaries on almost all of the Principal Upanishads around the 1600s. Vallabhacharya and Nimbarkacharya wrote (commentaries) on Brahma Sutras and Bhagavad Gita but they did not write commentaries on Upanishads. Like Ramanuja, they quoted many verses from Upanishads in their works. Baladeva Vidyabhushana in his Govinda Bhashya and Gita-bhusana-tika quoted verses from Upanishads but later wrote separate commentaries on each of the 10 Upanishads.