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