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D( c )
c^-1 = 0
c = 0
c^-1 = 0
c^-1 = 0
1*c^-1 = 0 // : 1
c^-1 = 0
c należy do O
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(3*c)/(c^-1) = 0
3*c^2 = 0 // : 3
c^2 = 0
c = 0
c in { 0}
c belongs to the empty set
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