def phi(self, i):
r"""
Compute `\phi_i` of ``self``.
EXAMPLES::
sage: KRT = KirillovReshetikhinTableaux(['D',4,1], 4, 1)
sage: KRT([-1, -4, 3, 2]).phi(1)
0
sage: KRT([-1, -4, 3, 2]).phi(3)
1
"""
return TensorProductOfCrystalsElement.phi(self, i) / 2
def phi(self, i):
r"""
Compute `\phi_i` of ``self``.
EXAMPLES::
sage: KRT = KirillovReshetikhinTableaux(['D',4,1], 4, 1)
sage: KRT([-1, -4, 3, 2]).phi(1)
0
sage: KRT([-1, -4, 3, 2]).phi(3)
1
"""
return TensorProductOfCrystalsElement.phi(self, i) / 2
