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 Conditional, Lambda, a, b, l
from proveit.logic import Equals, InSet
from proveit.numbers import Add, Integer, Mult, one

# build up the expression from sub-expressions
sub_expr1 = Add(l, one)
sub_expr2 = InSet(l, Integer)
expr = Equals(Lambda(l, Conditional(Mult(a, b, sub_expr1), sub_expr2)), Lambda(l, Conditional(Mult(sub_expr1, Mult(a, b)), sub_expr2))).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[l \mapsto \left\{a \cdot b \cdot \left(l + 1\right) \textrm{ if } l \in \mathbb{Z}\right..\right] =  \\ \left[l \mapsto \left\{\left(l + 1\right) \cdot \left(a \cdot b\right) \textrm{ if } l \in \mathbb{Z}\right..\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	Lambda	parameter: 22 body: 5
4	Lambda	parameter: 22 body: 7
5	Conditional	value: 8 condition: 10
6	ExprTuple	22
7	Conditional	value: 9 condition: 10
8	Operation	operator: 20 operands: 11
9	Operation	operator: 20 operands: 12
10	Operation	operator: 13 operands: 14
11	ExprTuple	24, 25, 15
12	ExprTuple	15, 16
13	Literal
14	ExprTuple	22, 17
15	Operation	operator: 18 operands: 19
16	Operation	operator: 20 operands: 21
17	Literal
18	Literal
19	ExprTuple	22, 23
20	Literal
21	ExprTuple	24, 25
22	Variable
23	Literal
24	Variable
25	Variable