Reference to a graph that is not there
File in which the problem appears
3_drude_model.md
Problematic sentence
In Exercise 2.4: Compare your sketch of \rho(T)
with that of the Lecture notes.
Comment
Such a figure does not appear in the Lecture notes, nor in the Oxford book. I know that it is shown in chapter three of "Solid State Physics" by J.R. Hook and H.E. Hall.
Correct version
Depends... The figure can be added to the notes or the question reformulated.