Naming the value
a := -2*b
x := a - b
b := 2*a - x
x := a - b
z := a + x
2b
2a-x
a-b
a+x
?
?
?
?
?
?
?
?
?
traditional: lexical name space
x
x-a
a+b
2a-b
-b
-3b
a+x
a-b
2a-x
2b
VNG: symbolic name space
S1
S2
S3
S4
S5
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