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D( h )
h = 0
h = 0
h = 0
h in (-oo:0) U (0:+oo)
16/h = 1 // - 1
16/h-1 = 0
16*h^-1 = 1 // : 16
h^-1 = 1/16
-1 < 0
1/(h^1) = 1/16 // * h^1
1 = 1/16*h^1 // : 1/16
16 = h^1
h = 16
h = 16
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