Expression of type Add

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, c, n
from proveit.numbers import Add, Neg, subtract, three, two

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

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())

-c + \left(a_{3} +  a_{4} +  \ldots +  a_{n - 2}\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',)

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Operation	operator: 12 operands: 1
1	ExprTuple	2, 3
2	Operation	operator: 19 operand: 6
3	Operation	operator: 12 operands: 5
4	ExprTuple	6
5	ExprTuple	7
6	Variable
7	ExprRange	lambda_map: 8 start_index: 9 end_index: 10
8	Lambda	parameter: 18 body: 11
9	Literal
10	Operation	operator: 12 operands: 13
11	IndexedVar	variable: 14 index: 18
12	Literal
13	ExprTuple	16, 17
14	Variable
15	ExprTuple	18
16	Variable
17	Operation	operator: 19 operand: 21
18	Variable
19	Literal
20	ExprTuple	21
21	Literal