I just revised that post: “Root Cause of Anicca – Five Stages of a Sankata”
There were no major errors, just needed to be updated.
firewns asked: “1a) What about Buddhadhamma? The teachings of Buddha cannot be anicca too, can it?”
No. Buddha Dhamma does not belong to the sankhara category. It is NOT anicca. But it belongs to the dhamma category, and hence “anatta (or without substance) AT THE END, after one has attained the Arahanthood.
– The Buddha said one needs to use Buddha Dhamma to get across the sansaric ocean. But just a raft is a burden to be carried after crossing a river, Buddha Dhamma also needs to be given up after attaining Nibbana.
– Buddha Dhamma is also a part of this world. The Buddha DISCOVERED it.
That should answer 1b) too. Once Buddha Dhamma disappears from the world, it is not known to the world until another Buddha appears and discovers it.
“2) What does ‘sammatta nana’ mean?”
It should really be ‘sammatta niyama’. I have given the following reference too:
“Sotapanna Anugami and a Sotapanna“