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D( u )
u = 0
1/u = 0
u = 0
u = 0
1/u = 0
1/u = 0
1*u^-1 = 0 // : 1
u^-1 = 0
u naleu017Cy do O
u in (-oo:0) U (0:+oo)
1/(1/u) = 0
u = 0
u in { 0}
u belongs to the empty set
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