
lch_sf(1):=3*alpha*p*u_x + alpha*p_t + 3*alpha*p_x*u - p*u_3x - 2*p_2x*u_x - 
p_3x*u - p_t2x - 2*p_x*u_2x$

lch_star_sf(1):= - alpha*p_t - 3*alpha*p_x*u + p_2x*u_x + p_3x*u + p_t2x + p_x*
u_2x$

;end;$
