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D( x )
ln(x) < 0
x <= 0
ln(x) = 0
ln(x) < 0
ln(x) < 0
ln(x)+0 < 0 // - 0
ln(x) < 0
ln(x) in (-oo:0)
ln(x) < ln(e^0)
x < e^0
x < 1
x <= 0
ln(x) = 0
ln(x) = 0
ln(x) = ln(e^0)
x = e^0
x = 1
x in (1:+oo)
(ln(x))^(-1/2) = 0
t_1 = ln(x)
1*t_1^(-1/2) = 0 // : 1
t_1^(-1/2) = 0
t_1 należy do O
x belongs to the empty set
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