(self, i, j)
return root
This is a method just to generate roots
        with a 1 iin the ith position and a -1
        in the jth postion.
This is a method just to generate roots
        with a 1 iin the ith position and a -1
        in the jth postion.
This is a method just to generate roots with a 1 iin the ith position and a - 1 in the jth postion .
def basic_root(self, i, j):
        """
        This is a method just to generate roots
        with a 1 iin the ith position and a -1
        in the jth postion.

        """

        n = self.n
        root = [0]*(n+1)
        root[i] = 1
        root[j] = -1
        return root
def basic_root ( self , i , j ) : n = self . n root = [ 0 ] * ( n + 1 ) root [ i ] = 1 root [ j ] = - 1 return root