Proof: Do Expr At Unchanged 73

Let's prove the following theorem:

if the following are true:

expression state at time 73 = "begin_expr"
the expression at time 73 = self."y" = 5

then the expression at time 74 = self."y" = 5

Proof:

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Given

1	expression state at time 73 = "begin_expr"
2	the expression at time 73 = self."y" = 5

Proof Table

#	Claim	Reason
1	the expression at time (73 + 1) = the expression at time 73	if expression state at time 73 = "begin_expr", then the expression at time (73 + 1) = the expression at time 73 (Insn Count Begin Expression (1))
2	the expression at time (73 + 1) = self."y" = 5	if the expression at time (73 + 1) = the expression at time 73 and the expression at time 73 = self."y" = 5, then the expression at time (73 + 1) = self."y" = 5 (Transitive Property of Equality)
3	73 + 1 = 74	73 + 1 = 74 (Fixed Value Statement)
4	the expression at time (73 + 1) = the expression at time 74	if 73 + 1 = 74, then the expression at time (73 + 1) = the expression at time 74 (Substitution)
5	the expression at time 74 = self."y" = 5	if the expression at time (73 + 1) = the expression at time 74 and the expression at time (73 + 1) = self."y" = 5, then the expression at time 74 = self."y" = 5 (Transitive Property of Equality Variation 2)

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