def epsilon(i, j, k):
 if ((i, j, k) in [(1, 2, 3), (2, 3, 1), (3, 1, 2)]):
  return 1
 elif ((i, j, k) in [(1, 3, 2), (3, 2, 1), (2, 1, 3)]):
  return (-1)
 else:
  return 0

def epsilon ( i , j , k ) : if ( ( i , j , k ) in [ ( 1 , 2 , 3 ) , ( 2 , 3 , 1 ) , ( 3 , 1 , 2 ) ] ) : return 1 elif ( ( i , j , k ) in [ ( 1 , 3 , 2 ) , ( 3 , 2 , 1 ) , ( 2 , 1 , 3 ) ] ) : return ( - 1 ) else : return 0
returns the value of the fuzz factor used in numeric expressions .