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