Proof: Do Tab At Unchanged 23

Let's prove the following theorem:

if the following are true:

expression state at time 23 = "call_function_begin"
the tab at time 23 = 2

then the tab at time 24 = 2

Proof:

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Given

1	expression state at time 23 = "call_function_begin"
2	the tab at time 23 = 2

Proof Table

#	Claim	Reason
1	the tab at time (23 + 1) = the tab at time 23	if expression state at time 23 = "call_function_begin", then the tab at time (23 + 1) = the tab at time 23 (Assign Parent (7))
2	the tab at time (23 + 1) = 2	if the tab at time (23 + 1) = the tab at time 23 and the tab at time 23 = 2, then the tab at time (23 + 1) = 2 (Transitive Property of Equality)
3	23 + 1 = 24	23 + 1 = 24 (Fixed Value Statement)
4	the tab at time (23 + 1) = the tab at time 24	if 23 + 1 = 24, then the tab at time (23 + 1) = the tab at time 24 (Substitution)
5	the tab at time 24 = 2	if the tab at time (23 + 1) = the tab at time 24 and the tab at time (23 + 1) = 2, then the tab at time 24 = 2 (Transitive Property of Equality Variation 2)

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