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, 4	, ,  ⊢
	: , : , : , :
1	theorem		⊢
	proveit.logic.equality.four_chain_transitivity
2	instantiation	11, 13, 7, 8, 5, 6, 15, 16, 17	, ,  ⊢
	: , : , : , : , : , : , :
3	instantiation	11, 7, 8, 13, 9, 10, 15, 16, 17	, ,  ⊢
	: , : , : , : , : , : , :
4	instantiation	11, 12, 13, 14, 15, 16, 17	, ,  ⊢
	: , : , : , : , : , : , :
5	instantiation	18	⊢
	: , :
6	instantiation	19	⊢
	: , : , :
7	theorem		⊢
	proveit.numbers.numerals.decimals.nat2
8	theorem		⊢
	proveit.numbers.numerals.decimals.nat3
9	instantiation	18	⊢
	: , :
10	instantiation	19	⊢
	: , : , :
11	theorem		⊢
	proveit.numbers.addition.leftward_commutation
12	theorem		⊢
	proveit.numbers.numerals.decimals.nat4
13	theorem		⊢
	proveit.numbers.numerals.decimals.nat1
14	instantiation	20	⊢
	: , : , : , :
15	assumption		⊢
16	assumption		⊢
17	assumption		⊢
18	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_2_typical_eq
19	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_3_typical_eq
20	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_4_typical_eq