Observations Helmholtz equation is unable to explain

[Tasell]

Can someone explain to me some of the key observations Helmholtz equation cannot explain and why that is so? Thanks!

 

[dextercioby]

Can someone explain to me some of the key observations Helmholtz equation cannot explain and why that is so? Thanks!

What's the connection to quantum mechanics ? Why didn't you post this in the mathematics forums ?

 

[Tasell]

What's the connection to quantum mechanics ? Why didn't you post this in the mathematics forums ?

Sorry, perhaps I should have added "quantum mechanical observations". But good idea, I should try it in the maths forum too.