How to Differentiate a Number by Victor Ufnarovski and Bo Åhlander (source code)

= How to Differentiate a Number by Victor Ufnarovski and Bo Åhlander
{c}
{tag=Work by Victor Ufnarovski}
{tag=Work by Bo Åhlander}
{title2=2003}
{title2=Journal of Integer Sequences 6, article 03.3.4}

https://cs.uwaterloo.ca/journals/JIS/VOL6/Ufnarovski/ufnarovski.pdf

§1, Theorem 1 gives the factorization formula for the <arithmetic derivative> and verifies its defining <product rule>.