Expression of type Lambda

from the theory of proveit.physics.quantum.circuits

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 A, IndexedVar, Lambda, N, Variable
from proveit.numbers import Add, Interval, one, subtract
from proveit.physics.quantum.circuits import Input, MultiQubitElem

# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
sub_expr2 = Variable("_b", latex_format = r"{_{-}b}")
expr = Lambda(sub_expr1, MultiQubitElem(element = Input(state = IndexedVar(A, sub_expr2), part = sub_expr1), targets = Interval(Add(IndexedVar(N, subtract(sub_expr2, one)), one), IndexedVar(N, sub_expr2))))

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())

{_{-}a} \mapsto \begin{array}{c} \Qcircuit@C=1em @R=.7em{
& \qin{A_{{_{-}b}}~\mbox{part}~{_{-}a}~\mbox{on}~\{N_{{_{-}b} - 1} + 1~\ldotp \ldotp~N_{{_{-}b}}\}} & \qw 
} \end{array}

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Lambda	parameter: 12 body: 2
1	ExprTuple	12
2	Operation	operator: 3 operands: 4
3	Literal
4	NamedExprs	element: 5 targets: 6
5	Operation	operator: 7 operands: 8
6	Operation	operator: 9 operands: 10
7	Literal
8	NamedExprs	state: 11 part: 12
9	Literal
10	ExprTuple	13, 14
11	IndexedVar	variable: 15 index: 24
12	Variable
13	Operation	operator: 22 operands: 16
14	IndexedVar	variable: 19 index: 24
15	Variable
16	ExprTuple	18, 28
17	ExprTuple	24
18	IndexedVar	variable: 19 index: 21
19	Variable
20	ExprTuple	21
21	Operation	operator: 22 operands: 23
22	Literal
23	ExprTuple	24, 25
24	Variable
25	Operation	operator: 26 operand: 28
26	Literal
27	ExprTuple	28
28	Literal