Expression of type ExprTuple

from the theory of proveit.numbers.division

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, ExprTuple, Lambda, a, b
from proveit.logic import And, InSet, NotEquals
from proveit.numbers import Rational, frac, zero

# build up the expression from sub-expressions
expr = ExprTuple(Lambda([a, b], Conditional(InSet(frac(a, b), Rational), And(InSet(a, Rational), InSet(b, Rational), NotEquals(b, zero)))))

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(a, b\right) \mapsto \left\{\frac{a}{b} \in \mathbb{Q} \textrm{ if } a \in \mathbb{Q} ,  b \in \mathbb{Q} ,  b \neq 0\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: 13 body: 2
2	Conditional	value: 3 condition: 4
3	Operation	operator: 15 operands: 5
4	Operation	operator: 6 operands: 7
5	ExprTuple	8, 20
6	Literal
7	ExprTuple	9, 10, 11
8	Operation	operator: 12 operands: 13
9	Operation	operator: 15 operands: 14
10	Operation	operator: 15 operands: 16
11	Operation	operator: 17 operands: 18
12	Literal
13	ExprTuple	19, 21
14	ExprTuple	19, 20
15	Literal
16	ExprTuple	21, 20
17	Literal
18	ExprTuple	21, 22
19	Variable
20	Literal
21	Variable
22	Literal