It is just as Nāgārjuna states in the Ratnavali:
If by refuting existence
there will be however be non-existence,
therefore, by refuting non-existence,
for what reason will there not be existence?
Thus, we again see the necessity of the step by step negation of the four extremes.
Malcolm, could you give a citation here so we can look at your translation from other sources please?
"there will be
"there will however be non-existence" or ""there will be however non-existence," whichever one prefers for readability?
the truth is so many assertions and contradictions have been asserted and dropped in this conversation that is would be impossible for someone who was not already versed in these issues to make any sense of it.
Do you recommend that we should accept that Nagarjuna, the prototypical Madhyamika, accepts the law of the excluded middle?