Expression of type Lambda

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

# build up the expression from sub-expressions
expr = Lambda([a, b], Conditional(InSet(frac(a, b), RealPos), And(InSet(a, RealPos), InSet(b, RealPos), 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(a, b\right) \mapsto \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()

no style options

# display the expression information
stored_expr.expr_info()

	core type	sub-expressions	expression
0	Lambda	parameters: 12 body: 1
1	Conditional	value: 2 condition: 3
2	Operation	operator: 14 operands: 4
3	Operation	operator: 5 operands: 6
4	ExprTuple	7, 19
5	Literal
6	ExprTuple	8, 9, 10
7	Operation	operator: 11 operands: 12
8	Operation	operator: 14 operands: 13
9	Operation	operator: 14 operands: 15
10	Operation	operator: 16 operands: 17
11	Literal
12	ExprTuple	18, 20
13	ExprTuple	18, 19
14	Literal
15	ExprTuple	20, 19
16	Literal
17	ExprTuple	20, 21
18	Variable
19	Literal
20	Variable
21	Literal