Let M be a differential manifold and α∈R. I define an α-derivation Xα as an application of the smooth functions such that:
Xα(fg)=Xα(f)gα+fαXα(g)
Xα(f+g)1/α=Xα(f)1/α+Xα(g)1/α
The definition makes sense because:
Xα((fg)h)=Xα(f(gh))=Xα(fgh)=
=Xα(f)(gh)α+fαXα(g)hα+(fg)αXα(h)
What are the α-derivations of the real smooth functions?