Proof: Do Expr At Unchanged 60

Let's prove the following theorem:

if the following are true:

expression state at time 60 = "begin_expr"
the expression at time 60 = __mul__(self.age, 12)

then the expression at time 61 = __mul__(self.age, 12)

Proof:

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Given

1	expression state at time 60 = "begin_expr"
2	the expression at time 60 = `__mul__(self.age, 12)`

Proof Table

#	Claim	Reason
1	the expression at time (60 + 1) = the expression at time 60	if expression state at time 60 = "begin_expr", then the expression at time (60 + 1) = the expression at time 60 (Insn Count Begin Expression (1))
2	the expression at time (60 + 1) = `__mul__(self.age, 12)`	if the expression at time (60 + 1) = the expression at time 60 and the expression at time 60 = `__mul__(self.age, 12)`, then the expression at time (60 + 1) = `__mul__(self.age, 12)` (Transitive Property of Equality)
3	60 + 1 = 61	60 + 1 = 61 (Fixed Value Statement)
4	the expression at time (60 + 1) = the expression at time 61	if 60 + 1 = 61, then the expression at time (60 + 1) = the expression at time 61 (Substitution)
5	the expression at time 61 = `__mul__(self.age, 12)`	if the expression at time (60 + 1) = the expression at time 61 and the expression at time (60 + 1) = `__mul__(self.age, 12)`, then the expression at time 61 = `__mul__(self.age, 12)` (Transitive Property of Equality Variation 2)

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