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D( u )
u = 0
u = 0
u = 0
u in (-oo:0) U (0:+oo)
-2/u = 2 // - 2
-2/u-2 = 0
-2*u^-1 = 2 // : -2
u^-1 = -1
-1 < 0
1/(u^1) = -1 // * u^1
1 = -1*u^1 // : -1
-1 = u^1
u = -1
u = -1
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