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D( t )
t-1 = 0
t = 0
t-1 = 0
t-1 = 0
t-1 = 0 // + 1
t = 1
t = 0
t = 0
t in (-oo:0) U (0:1) U (1:+oo)
(1/t-1)/(t-1) = 0
(t^-1-1)/(t-1) = 0
1*t^-1 = 1 // : 1
t^-1 = 1
-1 < 0
1/(t^1) = 1 // * t^1
1 = 1*t^1 // : 1
1 = t^1
t = 1
t in { 1}
t belongs to the empty set
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