# from the theory of proveit.physics.quantum.QPE¶

In [1]:
import proveit
# Automation is not needed when building an expression:
proveit.defaults.automation = False # This will speed things up.
proveit.defaults.inline_pngs = False # Makes files smaller.
%load_expr # Load the stored expression as 'stored_expr'
# import Expression classes needed to build the expression
from proveit.logic import Equals
from proveit.numbers import Exp, Mult, frac, one, subtract, two
from proveit.physics.quantum.QPE import _two_pow__t_minus_one, _two_pow_t

In [2]:
# build up the expression from sub-expressions
expr = Equals(subtract(_two_pow__t_minus_one, _two_pow__t_minus_one), subtract(Mult(frac(one, Exp(two, one)), _two_pow_t), _two_pow__t_minus_one))

expr:
In [3]:
# check that the built expression is the same as the stored expression
assert expr == stored_expr
assert expr._style_id == stored_expr._style_id
print("Passed sanity check: expr matches stored_expr")

Passed sanity check: expr matches stored_expr

In [4]:
# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())

\left(2^{t - 1} - 2^{t - 1}\right) = \left(\left(\frac{1}{2^{1}} \cdot 2^{t}\right) - 2^{t - 1}\right)

In [5]:
stored_expr.style_options()

namedescriptiondefaultcurrent valuerelated methods
operation'infix' or 'function' style formattinginfixinfix
wrap_positionsposition(s) at which wrapping is to occur; '2 n - 1' is after the nth operand, '2 n' is after the nth operation.()()('with_wrapping_at', 'with_wrap_before_operator', 'with_wrap_after_operator', 'without_wrapping', 'wrap_positions')
justificationif any wrap positions are set, justify to the 'left', 'center', or 'right'centercenter('with_justification',)
directionDirection of the relation (normal or reversed)normalnormal('with_direction_reversed', 'is_reversed')
In [6]:
# display the expression information
stored_expr.expr_info()

core typesub-expressionsexpression
0Operationoperator: 1
operands: 2
1Literal
2ExprTuple3, 4
3Operationoperator: 23
operands: 5
4Operationoperator: 23
operands: 6
5ExprTuple14, 8
6ExprTuple7, 8
7Operationoperator: 9
operands: 10
8Operationoperator: 28
operand: 14
9Literal
10ExprTuple12, 13
11ExprTuple14
12Operationoperator: 15
operands: 16
13Operationoperator: 21
operands: 17
14Operationoperator: 21
operands: 18
15Literal
16ExprTuple30, 19
17ExprTuple25, 26
18ExprTuple25, 20
19Operationoperator: 21
operands: 22
20Operationoperator: 23
operands: 24
21Literal
22ExprTuple25, 30
23Literal
24ExprTuple26, 27
25Literal
26Literal
27Operationoperator: 28
operand: 30
28Literal
29ExprTuple30
30Literal