Show the Proof

import proveit
# Automation is not needed when only showing a stored proof:
proveit.defaults.automation = False # This will speed things up.
proveit.defaults.inline_pngs = False # Makes files smaller.
%show_proof

	step type	requirements	statement
0	instantiation	1, 2, 3	⊢
	:
1	theorem		⊢
	proveit.numbers.number_sets.integers.neg_int_is_int_neg
2	instantiation	21, 4, 12	⊢
	: , : , :
3	instantiation	5, 6, 7	⊢
	: , : , :
4	instantiation	8, 10, 11	⊢
	: , :
5	theorem		⊢
	proveit.numbers.ordering.transitivity_less_eq_less
6	instantiation	9, 10, 11, 12	⊢
	: , : , :
7	instantiation	13, 14	⊢
	:
8	theorem		⊢
	proveit.numbers.number_sets.integers.int_interval_within_int
9	theorem		⊢
	proveit.numbers.number_sets.integers.interval_upper_bound
10	instantiation	15, 16	⊢
	:
11	instantiation	21, 17, 18	⊢
	: , : , :
12	assumption		⊢
13	theorem		⊢
	proveit.numbers.number_sets.integers.negative_if_in_neg_int
14	instantiation	19, 20	⊢
	:
15	theorem		⊢
	proveit.numbers.negation.int_closure
16	instantiation	21, 22, 23	⊢
	: , : , :
17	theorem		⊢
	proveit.numbers.number_sets.integers.nonpos_int_within_int
18	instantiation	24, 25	⊢
	:
19	theorem		⊢
	proveit.numbers.negation.int_neg_closure
20	theorem		⊢
	proveit.numbers.numerals.decimals.posnat3
21	theorem		⊢
	proveit.logic.sets.inclusion.superset_membership_from_proper_subset
22	theorem		⊢
	proveit.numbers.number_sets.integers.nat_within_int
23	theorem		⊢
	proveit.numbers.numerals.decimals.nat4
24	theorem		⊢
	proveit.numbers.negation.int_nonpos_closure
25	theorem		⊢
	proveit.numbers.numerals.decimals.nat3