/media/sda-magnetic/david/Extern-Magnetic-2022-06-29/Extern01/Dokumente-11-2021-07-05/informatik-math/comp-2021-09-07/differentation.txt

/*

Grammatik:

diff := diff' | expr'
expr := expr + term | expr - term | term
term := term * fact | term / fact | fact 
fact := const | 'x' |function | (diff)
function := f(diff) | g(diff) | h (diff)

*/