Proof: Do Line At Unchanged 43

Let's prove the following theorem:

if the following are true:

expression state at time 43 = "begin_expr"
the line at time 43 = 5

then the line at time 44 = 5

Proof:

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Given

1	expression state at time 43 = "begin_expr"
2	the line at time 43 = 5

Proof Table

#	Claim	Reason
1	the line at time (43 + 1) = the line at time 43	if expression state at time 43 = "begin_expr", then the line at time (43 + 1) = the line at time 43 (Insn Count Begin Expression (3))
2	the line at time (43 + 1) = 5	if the line at time (43 + 1) = the line at time 43 and the line at time 43 = 5, then the line at time (43 + 1) = 5 (Transitive Property of Equality)
3	43 + 1 = 44	43 + 1 = 44 (Fixed Value Statement)
4	the line at time (43 + 1) = the line at time 44	if 43 + 1 = 44, then the line at time (43 + 1) = the line at time 44 (Substitution)
5	the line at time 44 = 5	if the line at time (43 + 1) = the line at time 44 and the line at time (43 + 1) = 5, then the line at time 44 = 5 (Transitive Property of Equality Variation 2)

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