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D( p )
(4*p)^7 = 0
(4*p)^7 = 0
(4*p)^7 = 0
16384*p^7 = 0 // : 16384
p^7 = 0
p = 0
p in (-oo:0) U (0:+oo)
((4*p)^10)/((4*p)^7) = 0
64*p^3 = 0 // : 64
p^3 = 0
p = 0
p in { 0}
p belongs to the empty set
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