Expression of type Conditional

from the theory of proveit.logic.booleans.quantification

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
from proveit.core_expr_types import P__y_1_to_n, Q__y_1_to_n
from proveit.logic import NotEquals, TRUE

# build up the expression from sub-expressions
expr = Conditional(NotEquals(P__y_1_to_n, TRUE), Q__y_1_to_n)

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\{P\left(y_{1}, y_{2}, \ldots, y_{n}\right) \neq \top \textrm{ if } Q\left(y_{1}, y_{2}, \ldots, y_{n}\right)\right..

stored_expr.style_options()

name	description	default	current value	related methods
condition_delimiter	'comma' or 'and'	comma	comma	('with_comma_delimiter', 'with_conjunction_delimiter')

# display the expression information
stored_expr.expr_info()

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