Proof: Get Begin Expr Value 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
Value Stack at time 73 = [ ]

then Value Stack at time 74 = [ [ ], [ ] ]

Proof:

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Given

1	expression state at time 73 = "begin_expr"
2	the expression at time 73 = self."y" = 5
3	Value Stack at time 73 = [ ]

Proof Table

#	Claim	Reason
1	Value Stack at time (73 + 1) = [ [ ], Value Stack at time 73 ]	if expression state at time 73 = "begin_expr" and the expression at time 73 = self."y" = 5, then Value Stack at time (73 + 1) = [ [ ], Value Stack at time 73 ] (Begin Set Attribute Arguments (1))
2	[ [ ], Value Stack at time 73 ] = [ [ ], [ ] ]	if Value Stack at time 73 = [ ], then [ [ ], Value Stack at time 73 ] = [ [ ], [ ] ] (Substitution)
3	Value Stack at time (73 + 1) = [ [ ], [ ] ]	if Value Stack at time (73 + 1) = [ [ ], Value Stack at time 73 ] and [ [ ], Value Stack at time 73 ] = [ [ ], [ ] ], then Value Stack at time (73 + 1) = [ [ ], [ ] ] (Transitive Property of Equality)
4	73 + 1 = 74	73 + 1 = 74 (Fixed Value Statement)
5	Value Stack at time (73 + 1) = Value Stack at time 74	if 73 + 1 = 74, then Value Stack at time (73 + 1) = Value Stack at time 74 (Substitution)
6	Value Stack at time 74 = [ [ ], [ ] ]	if Value Stack at time (73 + 1) = Value Stack at time 74 and Value Stack at time (73 + 1) = [ [ ], [ ] ], then Value Stack at time 74 = [ [ ], [ ] ] (Transitive Property of Equality Variation 2)

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