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D( z )
z = 0
z = 0
z = 0
z in (-oo:0) U (0:+oo)
1/10 = 10/z // - 10/z
1/10-(10/z) = 0
1/10-10*z^-1 = 0
-10*z^-1 = -1/10 // : -10
z^-1 = 1/100
-1 < 0
1/(z^1) = 1/100 // * z^1
1 = 1/100*z^1 // : 1/100
100 = z^1
z = 100
z = 100
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