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.sets.unification.membership_folding
2	theorem		⊢
	proveit.numbers.numerals.decimals.posnat3
3	instantiation	5	⊢
	: , : , :
4	assumption		⊢
5	theorem		⊢
	proveit.numbers.numerals.decimals.tuple_len_3_typical_eq