Proof: Get Iterate Expr 2

Let's prove the following theorem:

if the following are true:

expression state at time 2 = "iterate_args"
arguments stack at time 2 = [ [ entry "ES": "Estonia", [ entry "MX": "Mexico", [ ] ] ], [ ] ]

then the expression at time 3 = entry "ES": "Estonia"

Proof:

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Given

1	expression state at time 2 = "iterate_args"
2	arguments stack at time 2 = [ [ entry "ES": "Estonia", [ entry "MX": "Mexico", [ ] ] ], [ ] ]

Proof Table

#	Claim	Reason
1	the expression at time (2 + 1) = entry "ES": "Estonia"	if expression state at time 2 = "iterate_args" and arguments stack at time 2 = [ [ entry "ES": "Estonia", [ entry "MX": "Mexico", [ ] ] ], [ ] ], then the expression at time (2 + 1) = entry "ES": "Estonia" (Iterate Arguments Expression Property)
2	2 + 1 = 3	2 + 1 = 3 (Fixed Value Statement)
3	the expression at time (2 + 1) = the expression at time 3	if 2 + 1 = 3, then the expression at time (2 + 1) = the expression at time 3 (Substitution)
4	the expression at time 3 = entry "ES": "Estonia"	if the expression at time (2 + 1) = the expression at time 3 and the expression at time (2 + 1) = entry "ES": "Estonia", then the expression at time 3 = entry "ES": "Estonia" (Transitive Property of Equality Variation 2)

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