(self)
return self.is_only_below_fermi
Always destroy a quasi-particle?  (annihilate hole or annihilate particle)

        >>> from sympy import Symbol
        >>> from sympy.physics.secondquant import Fd
        >>> a = Symbol('a', above_fermi=True)
        >>> i = Symbol('i', below_fermi=True)
        >>> p = Symbol('p')

        >>> Fd(a).is_only_q_annihilator
        False
        >>> Fd(i).is_only_q_annihilator
        True
        >>> Fd(p).is_only_q_annihilator
        False
Always destroy a quasi-particle?  (annihilate hole or annihilate particle)
Always destroy a quasi - particle? ( annihilate hole or annihilate particle )
def is_only_q_annihilator(self):
        """
        Always destroy a quasi-particle?  (annihilate hole or annihilate particle)

        >>> from sympy import Symbol
        >>> from sympy.physics.secondquant import Fd
        >>> a = Symbol('a', above_fermi=True)
        >>> i = Symbol('i', below_fermi=True)
        >>> p = Symbol('p')

        >>> Fd(a).is_only_q_annihilator
        False
        >>> Fd(i).is_only_q_annihilator
        True
        >>> Fd(p).is_only_q_annihilator
        False

        """
        return self.is_only_below_fermi
def is_only_q_annihilator ( self ) : return self . is_only_below_fermi