Expression of type Equals

from the theory of proveit.numbers.summation

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, b, l
from proveit.logic import Equals
from proveit.numbers import Add, Integer, Mult, Sum, one

# build up the expression from sub-expressions
sub_expr1 = Sum(index_or_indices = [l], summand = Add(l, one), domain = Integer)
expr = Equals(Mult(sub_expr1, Mult(a, b)), Mult(sub_expr1, a, b)).with_wrapping_at(2)

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())

\begin{array}{c} \begin{array}{l} \left(\left[\sum_{l \in \mathbb{Z}}~\left(l + 1\right)\right] \cdot \left(a \cdot b\right)\right) =  \\ \left(\left[\sum_{l \in \mathbb{Z}}~\left(l + 1\right)\right] \cdot a \cdot b\right) \end{array} \end{array}

stored_expr.style_options()

name	description	default	current value	related methods
operation	'infix' or 'function' style formatting	infix	infix
wrap_positions	position(s) at which wrapping is to occur; '2 n - 1' is after the nth operand, '2 n' is after the nth operation.	()	(2)	('with_wrapping_at', 'with_wrap_before_operator', 'with_wrap_after_operator', 'without_wrapping', 'wrap_positions')
justification	if any wrap positions are set, justify to the 'left', 'center', or 'right'	center	center	('with_justification',)
direction	Direction of the relation (normal or reversed)	normal	normal	('with_direction_reversed', 'is_reversed')

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Operation	operator: 1 operands: 2
1	Literal
2	ExprTuple	3, 4
3	Operation	operator: 9 operands: 5
4	Operation	operator: 9 operands: 6
5	ExprTuple	8, 7
6	ExprTuple	8, 13, 14
7	Operation	operator: 9 operands: 10
8	Operation	operator: 11 operand: 15
9	Literal
10	ExprTuple	13, 14
11	Literal
12	ExprTuple	15
13	Variable
14	Variable
15	Lambda	parameter: 25 body: 17
16	ExprTuple	25
17	Conditional	value: 18 condition: 19
18	Operation	operator: 20 operands: 21
19	Operation	operator: 22 operands: 23
20	Literal
21	ExprTuple	25, 24
22	Literal
23	ExprTuple	25, 26
24	Literal
25	Variable
26	Literal