D'Alembert equation 824 10 V(V·A+-x) at Vp+e(VA=_p Prove: substitute E=V×A E=vat Maxwell egs OE V×B=￡μoat ·E And using V×(V×A)=V(V·A)-V2A2 2 2 2 2 0 2 0 1 1 ( ) ( ) A A A J c t c t A t         − −    + = −     +   = −  Prove：substitute ， into Maxwell eqs And using B A   =  t A E   = − −    0 0 0 0 ,     +   =    = J E t E B     A A A    2  ( ) = (  ) −  4)． D’Alembert equation