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