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D( k )
k^0.5 = 0
k < 0
k^0.5 = 0
k^0.5 = 0
1*k^0.5 = 0 // : 1
k^0.5 = 0
k = 0
k < 0
k in (0:+oo)
k/(k^0.5) = 0
1*k^0.5 = 0 // : 1
k^0.5 = 0
k = 0
k in { 0}
k belongs to the empty set
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