import proveit
theory = proveit.Theory() # the theorem's theory
from proveit import defaults
from proveit.logic import InSet
from proveit.numbers import Real
from proveit.physics.quantum.QPE import _phase_is_real, _two_pow_t_is_nat_pos
%proving _delta_b_is_real
defaults.assumptions = _delta_b_is_real.all_conditions()
from proveit.physics.quantum.QPE import _delta_b_def
_delta_b_def
_delta_b_def_inst = _delta_b_def.instantiate()
InSet(_delta_b_def_inst.rhs, Real).prove()
%qed