A Different Mathematical Perspective " On The Ponderomotive Forces Exerted On Bodies At Rest In The Electromagnetic Field" by A.Einstein and J.Laub(1908)

A.Einstein and J.Laub(1908) have stated that forces vanish at infinity. In this brief note, it is shown shown that forces do not have to vanish only at infinity. Indeed, they are annihilated because

R=-1/c∫Ω_y(S_x+∂Ω_y/∂z) df+(1/c∫ S_xΩ_ydf) which implies R=-1/c∫Ω_y(∂Ω_y/∂z)df-

1/c∫(S_xΩydf)+1/c∫(S_xΩ_ydf)=-1/c(∫ ∂Ω_y/∂z)df. Note that -Ω_y∂Ω_z/∂y has been transformed to

-1/cΩ_y{S_x+∂Ω_y/∂z}, and divβ=0