Śrīharṣa against the Naiyāyikas: can every definition be refuted, and how did Nyāya answer him?
Its coordinates: 2.4 Skepticism · 2.4.1 Global vs Local Skepticism
Definitions are my bread and butter. A good definition in geometry settles what you are talking about, and then the proofs can begin.
I recently came across Śrīharṣa, the twelfth-century Advaitin, whose great work has a title usually translated as something like The Sweets of Refutation. As far as I can tell he takes the Nyāya definitions of valid knowledge, of correspondence, of difference and so on, one by one, and shows that each fails, often by showing that the definition requires further terms that themselves need defining, and so on without end. Then he does not offer a better definition.
As a teacher this baffles me. If you only destroy and never build, what is the point? And if he was an Advaitin, with a positive view of reality, why would he use a method that seems to undermine every definition, including any he might want for himself?
Could someone explain what he was up to, and how the Naiyāyikas responded?