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D( p )
p = 0
9*p^-4 = 0
p = 0
p = 0
9*p^-4 = 0
9*p^-4 = 0
9*p^-4 = 0 // : 9
p^-4 = 0
p należy do O
p in (-oo:0) U (0:+oo)
(27*p^2)/(9*p^-4) = 0
3*p^6 = 0 // : 3
p^6 = 0
p = 0
p in { 0}
p belongs to the empty set
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