def dmp_ground_LC(f, u, K):
 while u:
  f = dmp_LC(f, K)
  u -= 1
 return dup_LC(f, K)

def dmp_ground_LC ( f , u , K ) : while u : f = dmp_LC ( f , K ) u -= 1 return dup_LC ( f , K )
return the ground leading coefficient .