Expression of type Equals

from the theory of proveit.numbers.addition

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 ExprRange, IndexedVar, Variable, a, b, c, n
from proveit.core_expr_types import a_1_to_n
from proveit.logic import Equals
from proveit.numbers import Add, Neg, one, subtract, two

# build up the expression from sub-expressions
sub_expr1 = Variable("_a", latex_format = r"{_{-}a}")
sub_expr2 = Neg(c)
expr = Equals(Add(Add(a_1_to_n, b), subtract(sub_expr2, Add(ExprRange(sub_expr1, IndexedVar(a, sub_expr1), one, subtract(n, two))))), Add(IndexedVar(a, subtract(n, one)), IndexedVar(a, n), b, 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())

\left(\left(a_{1} +  a_{2} +  \ldots +  a_{n} + b\right) + \left(-c - \left(a_{1} +  a_{2} +  \ldots +  a_{n - 2}\right)\right)\right) = \left(a_{n - 1} + a_{n} + b - c\right)

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.	()	()	('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: 33 operands: 5
4	Operation	operator: 33 operands: 6
5	ExprTuple	7, 8
6	ExprTuple	9, 10, 16, 17
7	Operation	operator: 33 operands: 11
8	Operation	operator: 33 operands: 12
9	IndexedVar	variable: 35 index: 19
10	IndexedVar	variable: 35 index: 37
11	ExprTuple	15, 16
12	ExprTuple	17, 18
13	ExprTuple	19
14	ExprTuple	37
15	ExprRange	lambda_map: 29 start_index: 30 end_index: 37
16	Variable
17	Operation	operator: 40 operand: 23
18	Operation	operator: 40 operand: 24
19	Operation	operator: 33 operands: 22
20	ExprTuple	23
21	ExprTuple	24
22	ExprTuple	37, 25
23	Variable
24	Operation	operator: 33 operands: 26
25	Operation	operator: 40 operand: 30
26	ExprTuple	28
27	ExprTuple	30
28	ExprRange	lambda_map: 29 start_index: 30 end_index: 31
29	Lambda	parameter: 39 body: 32
30	Literal
31	Operation	operator: 33 operands: 34
32	IndexedVar	variable: 35 index: 39
33	Literal
34	ExprTuple	37, 38
35	Variable
36	ExprTuple	39
37	Variable
38	Operation	operator: 40 operand: 42
39	Variable
40	Literal
41	ExprTuple	42
42	Literal