Expression of type Forall

from the theory of proveit.numbers.negation

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, c
from proveit.logic import Equals, Forall
from proveit.numbers import Add, Natural, subtract

# build up the expression from sub-expressions
expr = Forall(instance_param_or_params = [a, b, c], instance_expr = Equals(subtract(c, a), b), domain = Natural, condition = Equals(Add(a, b), c))

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())

\forall_{a, b, c \in \mathbb{N}~|~\left(a + b\right) = c}~\left(\left(c - a\right) = b\right)

stored_expr.style_options()

name	description	default	current value	related methods
with_wrapping	If 'True', wrap the Expression after the parameters	None	None/False	('with_wrapping',)
condition_wrapping	Wrap 'before' or 'after' the condition (or None).	None	None/False	('with_wrap_after_condition', 'with_wrap_before_condition')
wrap_params	If 'True', wraps every two parameters AND wraps the Expression after the parameters	None	None/False	('with_params',)
justification	justify to the 'left', 'center', or 'right' in the array cells	center	center	('with_justification',)

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Operation	operator: 1 operand: 3
1	Literal
2	ExprTuple	3
3	Lambda	parameters: 4 body: 5
4	ExprTuple	31, 32, 26
5	Conditional	value: 6 condition: 7
6	Operation	operator: 21 operands: 8
7	Operation	operator: 9 operands: 10
8	ExprTuple	11, 32
9	Literal
10	ExprTuple	12, 13, 14, 15
11	Operation	operator: 29 operands: 16
12	Operation	operator: 19 operands: 17
13	Operation	operator: 19 operands: 18
14	Operation	operator: 19 operands: 20
15	Operation	operator: 21 operands: 22
16	ExprTuple	26, 23
17	ExprTuple	31, 24
18	ExprTuple	32, 24
19	Literal
20	ExprTuple	26, 24
21	Literal
22	ExprTuple	25, 26
23	Operation	operator: 27 operand: 31
24	Literal
25	Operation	operator: 29 operands: 30
26	Variable
27	Literal
28	ExprTuple	31
29	Literal
30	ExprTuple	31, 32
31	Variable
32	Variable