Proof: Do Tab At Unchanged 40

Let's prove the following theorem:

if the following are true:

expression state at time 40 = "call_function_begin"
the tab at time 40 = 2

then the tab at time 41 = 2

Proof:

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Given

1	expression state at time 40 = "call_function_begin"
2	the tab at time 40 = 2

Proof Table

#	Claim	Reason
1	the tab at time (40 + 1) = the tab at time 40	if expression state at time 40 = "call_function_begin", then the tab at time (40 + 1) = the tab at time 40 (Assign Parent (7))
2	the tab at time (40 + 1) = 2	if the tab at time (40 + 1) = the tab at time 40 and the tab at time 40 = 2, then the tab at time (40 + 1) = 2 (Transitive Property of Equality)
3	40 + 1 = 41	40 + 1 = 41 (Fixed Value Statement)
4	the tab at time (40 + 1) = the tab at time 41	if 40 + 1 = 41, then the tab at time (40 + 1) = the tab at time 41 (Substitution)
5	the tab at time 41 = 2	if the tab at time (40 + 1) = the tab at time 41 and the tab at time (40 + 1) = 2, then the tab at time 41 = 2 (Transitive Property of Equality Variation 2)

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