Expression of type Conditional

from the theory of proveit.logic.booleans.disjunction

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, Conditional
from proveit.logic import And, Boolean, InSet, Not, Or

# build up the expression from sub-expressions
expr = Conditional(Or(A, B), And(InSet(A, Boolean), InSet(B, Boolean), Not(And(Not(A), Not(B)))))

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\{A \lor B \textrm{ if } A \in \mathbb{B} ,  B \in \mathbb{B} ,  \lnot \left((\lnot A) \land (\lnot B)\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: 15 operands: 5
3	Literal
4	ExprTuple	22, 23
5	ExprTuple	6, 7, 8
6	Operation	operator: 10 operands: 9
7	Operation	operator: 10 operands: 11
8	Operation	operator: 20 operand: 14
9	ExprTuple	22, 13
10	Literal
11	ExprTuple	23, 13
12	ExprTuple	14
13	Literal
14	Operation	operator: 15 operands: 16
15	Literal
16	ExprTuple	17, 18
17	Operation	operator: 20 operand: 22
18	Operation	operator: 20 operand: 23
19	ExprTuple	22
20	Literal
21	ExprTuple	23
22	Variable
23	Variable