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and [tex] B(x,y,z,t)[/tex], they are also fullfiled by [tex] E(x,y,z,t)+ E_0[/tex]

and [tex] B(x,y,z,t)+B_0[/tex], where [tex] E_0[/tex] and [tex] B_0[/tex]

are constants. This freedom has physical significance as it changes the Lorentz force

which act on a charge. It implies that together with Maxwell equation we should

give some boundary condition. But unfortunately I can't find any book where they are

explicitly given (Dirichlet and Neumann boundary condition are most often introduced for

equation for potential not field).