def dmp_ground_TC(f, u, K):
 while u:
  f = dmp_TC(f, K)
  u -= 1
 return dup_TC(f, K)

def dmp_ground_TC ( f , u , K ) : while u : f = dmp_TC ( f , K ) u -= 1 return dup_TC ( f , K )
return the ground trailing coefficient .