For those interested, the author has a lot of similarly excellent explanations over the years: https://ciechanow.ski/archives/ https://ciechanow.ski/archives/

For those interested, the author has a lot of similarly excellent explanations over the years: https://ciechanow.ski/archives/ https://ciechanow.ski/archives/ I am curious about the 5 years gap between 2014 and 2019.