Expression of type Lambda

from the theory of proveit.logic.booleans.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, Conditional, Lambda
from proveit.logic import Boolean, InSet, Not

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

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())

A \mapsto \left\{(\lnot (\lnot A)) \in \mathbb{B} \textrm{ if } A \in \mathbb{B}\right..

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Lambda	parameter: 13 body: 1
1	Conditional	value: 2 condition: 3
2	Operation	operator: 5 operands: 4
3	Operation	operator: 5 operands: 6
4	ExprTuple	7, 8
5	Literal
6	ExprTuple	13, 8
7	Operation	operator: 11 operand: 10
8	Literal
9	ExprTuple	10
10	Operation	operator: 11 operand: 13
11	Literal
12	ExprTuple	13
13	Variable