The minimum would be to ask for D(a+b) = D(a) + D(b). EDIT: Actually, according to wikipedia, that is exactly what is done in differential algebra https://en.

The minimum would be to ask for D(a+b) = D(a) + D(b). EDIT: Actually, according to wikipedia, that is exactly what is done in differential algebra https://en.wikipedia.org/wiki/Differential_algebra https://en.wikipedia.org/wiki/Differential_algebra