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