Pierluigi Falco - Teaching

"To say that [omissis]'s theorem is unfamiliar to many physicists is most assuredly an understatement. Moreover, the full-blown proof is filled with innumerable details and lemmas which often obscure the basic point. Were we mathematicians this would pose no problem, since we could simply give some references and let the reader fend for himself. However, since we are physicists, we will proceed differently. [...]. The rigorous proof given in Sec. 3 is included because [...].
However, we strongly advise all the readers, [...], to omit Sec. 3"
(McCoy and Wu)