Ah, but this is indeed just us saying "hey, we don't see any monopoles anywhere, so let's simplify the equations to divB=0". The "full" equations have a divB={s

Ah, but this is indeed just us saying "hey, we don't see any monopoles anywhere, so let's simplify the equations to divB=0". The "full" equations have a divB={stuff that's perfectly symmetric to divE RHS}, and also a modified curlE term to make the "full" set of equations completely symmetric for electricity and magnetism. You can see these equations at https://en.wikipedia.org/wiki/Magnetic_monopole https://en.wikipedia.org/wiki/Magnetic_monopole