Expression of type Conditional

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, a, b
from proveit.logic import And, InSet, NotEquals
from proveit.numbers import Real, frac, zero

# build up the expression from sub-expressions
expr = Conditional(InSet(frac(a, b), Real), And(InSet(a, Real), InSet(b, Real), 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\{\frac{a}{b} \in \mathbb{R} \textrm{ if } a \in \mathbb{R} ,  b \in \mathbb{R} ,  b \neq 0\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: 13 operands: 3
2	Operation	operator: 4 operands: 5
3	ExprTuple	6, 18
4	Literal
5	ExprTuple	7, 8, 9
6	Operation	operator: 10 operands: 11
7	Operation	operator: 13 operands: 12
8	Operation	operator: 13 operands: 14
9	Operation	operator: 15 operands: 16
10	Literal
11	ExprTuple	17, 19
12	ExprTuple	17, 18
13	Literal
14	ExprTuple	19, 18
15	Literal
16	ExprTuple	19, 20
17	Variable
18	Literal
19	Variable
20	Literal