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	⊢
	: , : , :
1	theorem		⊢
	proveit.core_expr_types.tuples.range_len
2	instantiation	31, 3, 4	⊢
	: , : , :
3	theorem		⊢
	proveit.numbers.number_sets.natural_numbers.nat_pos_within_nat
4	instantiation	5, 6, 7, 8, 9, 10, 11, 12, 13	⊢
	: , : , : , : , :
5	theorem		⊢
	proveit.numbers.addition.add_nat_pos_from_nonneg
6	theorem		⊢
	proveit.numbers.numerals.decimals.nat2
7	axiom		⊢
	proveit.numbers.number_sets.natural_numbers.zero_in_nats
8	instantiation	14	⊢
	: , :
9	theorem		⊢
	proveit.core_expr_types.tuples.tuple_len_0_typical_eq
10	instantiation	15, 16, 17	⊢
	:
11	instantiation	18, 19, 20	⊢
	: , : , :
12	theorem		⊢
	proveit.numbers.numerals.decimals.nat1
13	theorem		⊢
	proveit.numbers.numerals.decimals.less_0_1
14	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_2_typical_eq
15	theorem		⊢
	proveit.numbers.number_sets.integers.nonneg_int_is_natural
16	instantiation	21, 22, 23	⊢
	: , :
17	instantiation	24, 25	⊢
	: , :
18	theorem		⊢
	proveit.logic.sets.inclusion.unfold_subset_eq
19	instantiation	26, 27	⊢
	: , :
20	instantiation	28, 29	⊢
	: , :
21	theorem		⊢
	proveit.numbers.addition.add_int_closure_bin
22	instantiation	31, 30, 35	⊢
	: , : , :
23	instantiation	31, 32, 33	⊢
	: , : , :
24	theorem		⊢
	proveit.numbers.addition.subtraction.nonneg_difference
25	instantiation	34, 35	⊢
	:
26	theorem		⊢
	proveit.logic.sets.inclusion.relax_proper_subset
27	theorem		⊢
	proveit.numbers.number_sets.natural_numbers.zero_set_within_nat
28	theorem		⊢
	proveit.logic.sets.enumeration.fold_singleton
29	theorem		⊢
	proveit.numbers.negation.negated_zero
30	theorem		⊢
	proveit.numbers.number_sets.integers.nat_pos_within_int
31	theorem		⊢
	proveit.logic.sets.inclusion.superset_membership_from_proper_subset
32	theorem		⊢
	proveit.numbers.number_sets.integers.neg_int_within_int
33	instantiation	36, 37	⊢
	:
34	theorem		⊢
	proveit.numbers.number_sets.natural_numbers.natural_pos_lower_bound
35	assumption		⊢
36	theorem		⊢
	proveit.numbers.negation.int_neg_closure
37	theorem		⊢
	proveit.numbers.numerals.decimals.posnat1