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D( z )
z^(1/20) = 0
z < 0
z^(1/20) = 0
z^(1/20) = 0
1*z^(1/20) = 0 // : 1
z^(1/20) = 0
z = 0
z < 0
z in (0:+oo)
(((2*z)^(1/5))^4)/(z^(1/20)) = 0
2^(4/5)*z^(3/4) = 0 // : 2^(4/5)
z^(3/4) = 0
z = 0
z in { 0}
z belongs to the empty set
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