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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w+16/w = w/16 // - w/16
w-(w/16)+16/w = 0
15/16*w^1+16*w^-1 = 0
(15/16*w^2+16*w^0)/(w^1) = 0 // * w^2
w^1*(15/16*w^2+16*w^0) = 0
w^1
(15/16)*w^2+16 = 0
(15/16)*w^2+16 = 0
DELTA = 0^2-(4*16*(15/16))
DELTA = -60
DELTA < 0
w in { }
w belongs to the empty set
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