Expression of type ExprTuple

from the theory of proveit.logic.sets.equivalence

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, ExprTuple, Lambda, P, PofA, PofB
from proveit.logic import And, SetEquiv

# build up the expression from sub-expressions
expr = ExprTuple(Lambda([P, A, B], Conditional(PofA, And(PofB, SetEquiv(A, 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(\left(P, A, B\right) \mapsto \left\{P\left(A\right) \textrm{ if } P\left(B\right) ,  A \cong B\right..\right)

stored_expr.style_options()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	ExprTuple	1
1	Lambda	parameters: 2 body: 3
2	ExprTuple	11, 15, 16
3	Conditional	value: 4 condition: 5
4	Operation	operator: 11 operand: 15
5	Operation	operator: 7 operands: 8
6	ExprTuple	15
7	Literal
8	ExprTuple	9, 10
9	Operation	operator: 11 operand: 16
10	Operation	operator: 13 operands: 14
11	Variable
12	ExprTuple	16
13	Literal
14	ExprTuple	15, 16
15	Variable
16	Variable