Why is Galois group computation failing?
L = NumberField(x^2 - x - 1, 'theta')
G = L.galois_group()
works
L = NumberField(x^3 - x - 1, 'theta')
G = L.galois_group()
gives me the error
TypeError: You must specify the name of the generator.
Because the first one is Galois, hence does not need a new name for its generator. Use
G = L.galois_group(names='a')for the second one.