diff ( y , x , 1 ) = log ( x ) ; ! Digits := 32; max_terms := 30; ! x_start := 20.0; x_end := 30.0 ; array_y_init[1] := exact_soln_y(x_start); glob_h := 0.00001 ; glob_look_poles := true; glob_max_iter := 20; ! exact_soln_y := proc(x) x*log(x)-x end;