I rewrote completely this article. Thanks for your kind and patient remarks. Thet were very useful.

For the time being, the rewriting is still in github (I will bring it to Medium) and it has not reached the stage explaining npm, npv. But it is much more ambitious, and I'll come gradually to explaning npm-npv.

https://github.com/kvutien/Project-Machu_Picchu_White_Paper_Tutorial2023