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D( z )
z^4*((16*z^8)/8) = 0
z^4*((16*z^8)/8) = 0
z^4*((16*z^8)/8) = 0
2*z^12 = 0 // : 2
z^12 = 0
z = 0
z in (-oo:0) U (0:+oo)
(z^4*((16*z^8)/8))^-2 = 0
1/4*z^-24 = 0 // : 1/4
z^-24 = 0
z naleu017Cy do O
z belongs to the empty set
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