Proof: Do Expr At Unchanged 56

Let's prove the following theorem:

if the following are true:

expression state at time 56 = "call_function_begin"
the expression at time 56 = p.age_in_months()

then the expression at time 57 = p.age_in_months()

Proof:

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Given

1	expression state at time 56 = "call_function_begin"
2	the expression at time 56 = `p.age_in_months()`

Proof Table

#	Claim	Reason
1	the expression at time (56 + 1) = the expression at time 56	if expression state at time 56 = "call_function_begin", then the expression at time (56 + 1) = the expression at time 56 (Assign Parent (3))
2	the expression at time (56 + 1) = `p.age_in_months()`	if the expression at time (56 + 1) = the expression at time 56 and the expression at time 56 = `p.age_in_months()`, then the expression at time (56 + 1) = `p.age_in_months()` (Transitive Property of Equality)
3	56 + 1 = 57	56 + 1 = 57 (Fixed Value Statement)
4	the expression at time (56 + 1) = the expression at time 57	if 56 + 1 = 57, then the expression at time (56 + 1) = the expression at time 57 (Substitution)
5	the expression at time 57 = `p.age_in_months()`	if the expression at time (56 + 1) = the expression at time 57 and the expression at time (56 + 1) = `p.age_in_months()`, then the expression at time 57 = `p.age_in_months()` (Transitive Property of Equality Variation 2)

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