Undergrad Is this Lennard Jones potential image wrong on the Wikipedia Italian page?

[eneacasucci]

I found this image on the wikipedia italian page for the Lennard-Jones potential and I think the derivative displayed are wrong: not only in that reange (below r_eq) the negative derivative of the force should be negative and vice versa, but also the physcal meaning is that F(r) = - \frac{dU(r)}{dr} so I think that this is the derivative that should be displayed.

 

[Steve4Physics]

I found this image on the wikipedia italian page for the Lennard-Jones potential and I think the derivative displayed are wrong: not only in that reange (below r_eq) the negative derivative of the force should be negative and vice versa, but also the physcal meaning is that F(r) = - \frac{dU(r)}{dr} so I think that this is the derivative that should be displayed.
View attachment 364615

I agree.

It would appear that $- \frac {\partial F}{\partial r}$ should be $- \frac{dU} {dr}$, which is the force, $F(r)$.

(Since $U(r)$ is a function of $r$ only, I don’t think a partial derivative is appropriate.)

When $F(r)>0$ (for $r<r_0$) we have repulsion.
When $F(r)<0$ (for $r>r_0$) we have attraction.