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D( d )
d = 0
d^-9 = 0
d = 0
d = 0
d^-9 = 0
d^-9 = 0
1*d^-9 = 0 // : 1
d^-9 = 0
d należy do O
d in (-oo:0) U (0:+oo)
(8^0)/(d^-9) = 0
1/(d^-9) = 0
1*d^9 = 0 // : 1
d^9 = 0
d = 0
d in { 0}
d belongs to the empty set
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