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D( i )
i^-15 = 0
i = 0
i^-15 = 0
i^-15 = 0
1*i^-15 = 0 // : 1
i^-15 = 0
i należy do O
i = 0
i = 0
i in (-oo:0) U (0:+oo)
1/(i^-15) = 0
1*i^15 = 0 // : 1
i^15 = 0
i = 0
i in { 0}
i belongs to the empty set
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