Proof: Do Expr At Unchanged 28

Let's prove the following theorem:

if the following are true:

expression state at time 28 = "begin_expr"
the expression at time 28 = __setitem__(locations, "ES", "Spain")

then the expression at time 29 = __setitem__(locations, "ES", "Spain")

Proof:

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Given

1	expression state at time 28 = "begin_expr"
2	the expression at time 28 = `__setitem__(locations, "ES", "Spain")`

Proof Table

#	Claim	Reason
1	the expression at time (28 + 1) = the expression at time 28	if expression state at time 28 = "begin_expr", then the expression at time (28 + 1) = the expression at time 28 (Insn Count Begin Expression (1))
2	the expression at time (28 + 1) = `__setitem__(locations, "ES", "Spain")`	if the expression at time (28 + 1) = the expression at time 28 and the expression at time 28 = `__setitem__(locations, "ES", "Spain")`, then the expression at time (28 + 1) = `__setitem__(locations, "ES", "Spain")` (Transitive Property of Equality)
3	28 + 1 = 29	28 + 1 = 29 (Fixed Value Statement)
4	the expression at time (28 + 1) = the expression at time 29	if 28 + 1 = 29, then the expression at time (28 + 1) = the expression at time 29 (Substitution)
5	the expression at time 29 = `__setitem__(locations, "ES", "Spain")`	if the expression at time (28 + 1) = the expression at time 29 and the expression at time (28 + 1) = `__setitem__(locations, "ES", "Spain")`, then the expression at time 29 = `__setitem__(locations, "ES", "Spain")` (Transitive Property of Equality Variation 2)

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