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D( p )
0.5*p^2 = 0
0.5*p^2 = 0
0.5*p^2 = 0
0.5*p^2 = 0 // : 0.5
p^2 = 0
p = 0
p in (-oo:0) U (0:+oo)
(2*p)/(0.5*p^2) = 0
4*p^-1 = 0 // : 4
p^-1 = 0
p naleu017Cy do O
p belongs to the empty set
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