Proof: Do Line At Unchanged 73

Let's prove the following theorem:

if the following are true:

expression state at time 73 = "call_function_begin"
the line at time 73 = 7

then the line at time 74 = 7

Proof:

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Given

1	expression state at time 73 = "call_function_begin"
2	the line at time 73 = 7

Proof Table

#	Claim	Reason
1	the line at time (73 + 1) = the line at time 73	if expression state at time 73 = "call_function_begin", then the line at time (73 + 1) = the line at time 73 (Assign Parent (6))
2	the line at time (73 + 1) = 7	if the line at time (73 + 1) = the line at time 73 and the line at time 73 = 7, then the line at time (73 + 1) = 7 (Transitive Property of Equality)
3	73 + 1 = 74	73 + 1 = 74 (Fixed Value Statement)
4	the line at time (73 + 1) = the line at time 74	if 73 + 1 = 74, then the line at time (73 + 1) = the line at time 74 (Substitution)
5	the line at time 74 = 7	if the line at time (73 + 1) = the line at time 74 and the line at time (73 + 1) = 7, then the line at time 74 = 7 (Transitive Property of Equality Variation 2)

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