On the global existence of real analytic solutions of linear differential equations, II
On the global existence of real analytic solutions of linear differential equations, II
O. In our previous note [9] we have presented a global existence theorem of real analytic solutions for a linear differential operator P(D) with constant coefficients assuming condition (1) below.The principal symbol P() of P(D) is real and of simple char-( 1 acteristics, i.e., grad, P:/:0 whenever P($)=0, where is …