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D( s )
s = 0
s = 0
s = 0
s in (-oo:0) U (0:+oo)
-9/s = 9 // - 9
-9/s-9 = 0
-9*s^-1 = 9 // : -9
s^-1 = -1
-1 < 0
1/(s^1) = -1 // * s^1
1 = -1*s^1 // : -1
-1 = s^1
s = -1
s = -1
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