def unit(self):
    ' root of the irreducible polynomial\n        e.g. return element 1*A+0 (or the complex value i) if the irpoly is X**2+1\n        '
    I = self.zero()
    I.poly.coef[(- 2)] = self.F.one()
    return I
root of the irreducible polynomial
e.g. return element 1*A+0 (or the complex value i) if the irpoly is X**2+1
def unit(self):
    ' root of the irreducible polynomial\n        e.g. return element 1*A+0 (or the complex value i) if the irpoly is X**2+1\n        '
    I = self.zero()
    I.poly.coef[(- 2)] = self.F.one()
    return I