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D( p )
p = 0
p = 0
p = 0
p in (-oo:0) U (0:+oo)
16 = (4/1)/p // - (4/1)/p
16-((4/1)/p) = 0
16-4*p^-1 = 0
-4*p^-1 = -16 // : -4
p^-1 = 4
-1 < 0
1/(p^1) = 4 // * p^1
1 = 4*p^1 // : 4
1/4 = p^1
p = 1/4
p = 1/4
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