My textbook had a section where a particle beam was going over a barrier where E > U and then right after that had a part about resonant transmission. It then went on to talk about Tunneling through a barrier when U > E. It didn't give a new resonant transmission equation and i assume the equation would be different... So yeah, if a particle beam is tunneling through a barrier (U>E) there is no resonant transmission? P.S. what math skills should i have before investing in griffiths quantum intro?