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D( i )
8*i = 0
8*i = 0
8*i = 0
8*i = 0 // : 8
i = 0
i in (-oo:0) U (0:+oo)
(2*i-(4*i))/(8*i) = 0
(2*i-4*i)/(8*i) = 0
(-2*i)/(8*i) = 0
-2*i = 0 // : -2
i = 0
i in { 0}
i belongs to the empty set
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