When Nāgārjuna says he has no thesis, isn’t that a thesis?
One idea in Nāgārjuna keeps catching on me like a boot on a root.
Nāgārjuna says (I think in a work called the Vigrahavyāvartanī) that if he had a thesis, the fault the opponent points out would apply to him, but since he has no thesis, there is no fault. So he refutes other positions without holding one.
But surely "I have no thesis" is itself a thesis? And "everything is empty" sounds very much like a claim about everything. When I explain this to curious trekkers, the clever ones always say this, and I don't have a good answer. I just say "it's subtle", which is what people say when they don't understand.
Could someone explain how Mādhyamikas answer this? I would like an answer I can give on a mountain to someone with an engineering degree and no patience.