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D( s )
(2*s^4)/(s^0) = 0
s = 0
s^0 = 0
(2*s^4)/(s^0) = 0
(2*s^4)/(s^0) = 0
2*s^4 = 0
2*s^4 = 0 // : 2
s^4 = 0
s = 0
s = 0
s = 0
s^0 = 0
s^0 = 0
1 = 0
s^0 = 0
1 = 0
s belongs to the empty set
s in (-oo:0) U (0:+oo)
((2*s^4)/(s^0))^-1 = 0
(2*s^4)^-1 = 0
1/2*s^-4 = 0 // : 1/2
s^-4 = 0
s należy do O
s belongs to the empty set
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