Proof: Do Line At Unchanged 28

Let's prove the following theorem:

if the following are true:

expression state at time 28 = "begin_expr"
the line at time 28 = 4

then the line at time 29 = 4

Proof:

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Given

1	expression state at time 28 = "begin_expr"
2	the line at time 28 = 4

Proof Table

#	Claim	Reason
1	the line at time (28 + 1) = the line at time 28	if expression state at time 28 = "begin_expr", then the line at time (28 + 1) = the line at time 28 (Insn Count Begin Expression (3))
2	the line at time (28 + 1) = 4	if the line at time (28 + 1) = the line at time 28 and the line at time 28 = 4, then the line at time (28 + 1) = 4 (Transitive Property of Equality)
3	28 + 1 = 29	28 + 1 = 29 (Fixed Value Statement)
4	the line at time (28 + 1) = the line at time 29	if 28 + 1 = 29, then the line at time (28 + 1) = the line at time 29 (Substitution)
5	the line at time 29 = 4	if the line at time (28 + 1) = the line at time 29 and the line at time (28 + 1) = 4, then the line at time 29 = 4 (Transitive Property of Equality Variation 2)

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