Dyako Rebwar Mahmood Baram

### end goal: i want to be able to do derivative until I get a single number for example: fx= x^3 + x^2 - 3x -3 fx'=3x^2 +2x-3 fx''=6x-2 fx'''=6...

### Steps to reproduce in the library group the items by Authors ### Expected behavior if an author had 2 titles and both had different casing for the Author name...