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D( p )
(4*p)^2 = 0
(4*p)^2 = 0
(4*p)^2 = 0
16*p^2 = 0 // : 16
p^2 = 0
p = 0
p in (-oo:0) U (0:+oo)
(4*p^3)/((4*p)^2) = 0
1/4*p = 0 // : 1/4
p = 0
p in { 0}
p belongs to the empty set
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