Equation Icon  ∫ ∫ ---1--- ik⋅x n --1---- −ik⋅x n [H (t)v](x ) := (2π )nāˆ•2 H (t,x,k āˆ•|k |)e ˆv(k)d k, ˆv(k) = (2 π)nāˆ•2 e v(x)d x, (3.82 )