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D( i )
i-1 = 0
i-1 = 0
i-1 = 0
i-1 = 0 // + 1
i = 1
i in (-oo:1) U (1:+oo)
(i+1)^2 = (i-1)/(i-1) // - (i-1)/(i-1)
(i+1)^2-((i-1)/(i-1)) = 0
(i+1)^2-1 = 0
(i+1)^2-1 = 0
i^2+2*i = 0
i^2+2*i = 0
i*(i+2) = 0
i+2 = 0 // - 2
i = -2
i*(i+2) = 0
i*(i+2) = 0
( i+2 )
i+2 = 0 // - 2
i = -2
( i )
i = 0
i in { -2, 0 }
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