close Two dupes (and low-quality questions) posted by a new user: 1, 2.

D1, D2, D3.

D4, D5, D6.

D7, D8, D9.

D10, D11, D12.

Inappropriate for this site: math.stackexchange.com/questions/3852832/…. Asker links an "article" they've written and asks for us to review it for context.

@JoséCarlosSantos Both are closed for being low quality, the first is now deleted.

@amWhy Thank you.