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