Proof: Do Expr At Unchanged 62

Let's prove the following theorem:

if the following are true:

expression state at time 62 = "begin_expr"
the expression at time 62 = self.age

then the expression at time 63 = self.age

Proof:

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Given

1	expression state at time 62 = "begin_expr"
2	the expression at time 62 = `self.age`

Proof Table

#	Claim	Reason
1	the expression at time (62 + 1) = the expression at time 62	if expression state at time 62 = "begin_expr", then the expression at time (62 + 1) = the expression at time 62 (Insn Count Begin Expression (1))
2	the expression at time (62 + 1) = `self.age`	if the expression at time (62 + 1) = the expression at time 62 and the expression at time 62 = `self.age`, then the expression at time (62 + 1) = `self.age` (Transitive Property of Equality)
3	62 + 1 = 63	62 + 1 = 63 (Fixed Value Statement)
4	the expression at time (62 + 1) = the expression at time 63	if 62 + 1 = 63, then the expression at time (62 + 1) = the expression at time 63 (Substitution)
5	the expression at time 63 = `self.age`	if the expression at time (62 + 1) = the expression at time 63 and the expression at time (62 + 1) = `self.age`, then the expression at time 63 = `self.age` (Transitive Property of Equality Variation 2)

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