Proof: Do Expr At Unchanged 54

Let's prove the following theorem:

if the following are true:

expression state at time 54 = "begin_expr"
the expression at time 54 = p.age_in_months()

then the expression at time 55 = p.age_in_months()

Proof:

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Given

1	expression state at time 54 = "begin_expr"
2	the expression at time 54 = `p.age_in_months()`

Proof Table

#	Claim	Reason
1	the expression at time (54 + 1) = the expression at time 54	if expression state at time 54 = "begin_expr", then the expression at time (54 + 1) = the expression at time 54 (Insn Count Begin Expression (1))
2	the expression at time (54 + 1) = `p.age_in_months()`	if the expression at time (54 + 1) = the expression at time 54 and the expression at time 54 = `p.age_in_months()`, then the expression at time (54 + 1) = `p.age_in_months()` (Transitive Property of Equality)
3	54 + 1 = 55	54 + 1 = 55 (Fixed Value Statement)
4	the expression at time (54 + 1) = the expression at time 55	if 54 + 1 = 55, then the expression at time (54 + 1) = the expression at time 55 (Substitution)
5	the expression at time 55 = `p.age_in_months()`	if the expression at time (54 + 1) = the expression at time 55 and the expression at time (54 + 1) = `p.age_in_months()`, then the expression at time 55 = `p.age_in_months()` (Transitive Property of Equality Variation 2)

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