Proof: Do Tab At Unchanged 70

Let's prove the following theorem:

if the following are true:

expression state at time 70 = "begin_expr"
the tab at time 70 = 2

then the tab at time 71 = 2

Proof:

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Given

1	expression state at time 70 = "begin_expr"
2	the tab at time 70 = 2

Proof Table

#	Claim	Reason
1	the tab at time (70 + 1) = the tab at time 70	if expression state at time 70 = "begin_expr", then the tab at time (70 + 1) = the tab at time 70 (Insn Count Begin Expression (4))
2	the tab at time (70 + 1) = 2	if the tab at time (70 + 1) = the tab at time 70 and the tab at time 70 = 2, then the tab at time (70 + 1) = 2 (Transitive Property of Equality)
3	70 + 1 = 71	70 + 1 = 71 (Fixed Value Statement)
4	the tab at time (70 + 1) = the tab at time 71	if 70 + 1 = 71, then the tab at time (70 + 1) = the tab at time 71 (Substitution)
5	the tab at time 71 = 2	if the tab at time (70 + 1) = the tab at time 71 and the tab at time (70 + 1) = 2, then the tab at time 71 = 2 (Transitive Property of Equality Variation 2)

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