As I discuss in this question, by far the most popular school of Hindu philosophy is the Vedanta school, which bases its tenets on the doctrines laid out in the Brahma Sutras, a work by the sage Vyasa that summarizes and systematizes the philosophical teachings of the Upanishads. (You can read the Brahma Sutras here.) I'm interested in the epistemology of the Vedanta school.
Now Narayana Bhattar was a mathematician, philosopher, and poet who is most famous for the Narayaneeyam, a poem summarizing the Srimad Bhagavatam. But he also wrote a work on the Purva Mimamsa school, the Manemyodaya. In this excerpt from the Manameyodaya, Narayana Bhattar discusses the Pramanas or means of valid knowledge accepted by different schools of Indian philosophy:
Perception and inference, similarly authority and analogy, presumption and negation - these are the six means of valid knowledge for those who think like us. Charvakas speak of one; the Buddhists and the Vaisheshikas speak of two; Bhasarvajna and the Samkhyas speak of three; Udayana and others speak of four; the followers of Prabhakara speak of five; we and those well-versed in Vedanta speak of six; the Pauranikas, however, speak of eight, adding inclusion and tradition.
I'm interested in the part in bold. The "we" refers to the followers of the Purva Mimamsa philosopher Kumarila Bhatta. Narayana Bhattar is saying that the Vedanta school accepts the same six Pramanas that Kumarila Bhatta does: Pratyaksha or perception, Anumana or inference, Shabda or authority, Upamana or analogy, Arthapatti or presumption, and Anupalabdhi or negation.
Now within the Vedanta school, there are numerous philosophies, including Adi Shankaracharya's philosophy of Advaita, Ramanujacharya's philosophy of Visistadvaita, Madhvacharya's philosophy of Dvaita, Chaitanya Mahaprabhu's philosophy of Achintya Bheda Abheda, Nimbarkacharya's philosophy of Dvaitadvaita, and Vallabhacharya's philosophy of Shuddhadvaita. My question is, do all these Vedantic philosophies agree on this list of six Pramanas? Or do different Vedantic philosophies believe in different numbers of Pramanas?
If different Vedantic philosophies do differ on this, then the figure of six Pramanas would probably be for Advaita, since I've heard that Narayana Bhattar may have been an Advaitin.