Expression of type NamedExprs

from the theory of proveit.physics.quantum.QPE

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 import NamedExprs, U, Variable
from proveit.linear_algebra import MatrixExp
from proveit.numbers import Exp, Neg, two

# build up the expression from sub-expressions
expr = NamedExprs(("operation", MatrixExp(U, Exp(two, Neg(Variable("_b", latex_format = r"{_{-}b}"))))), ("part", Variable("_a", latex_format = r"{_{-}a}")))

expr:

# 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

# Show the LaTeX representation of the expression for convenience if you need it.
print(stored_expr.latex())

\left\{ \begin{array}{l}
{\rm operation}: U^{2^{-{_{-}b}}}\\
{\rm part}: {_{-}a}\\
\end{array} \right\}

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	NamedExprs	operation: 1 part: 2
1	Operation	operator: 3 operands: 4
2	Variable
3	Literal
4	ExprTuple	5, 6
5	Variable
6	Operation	operator: 7 operands: 8
7	Literal
8	ExprTuple	9, 10
9	Literal
10	Operation	operator: 11 operand: 13
11	Literal
12	ExprTuple	13
13	Variable