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D( c )
c^-4 = 0
c = 0
c^-4 = 0
c^-4 = 0
1*c^-4 = 0 // : 1
c^-4 = 0
c należy do O
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(2*c^-7)/(c^-4) = 0
2*c^-3 = 0 // : 2
c^-3 = 0
c należy do O
c belongs to the empty set
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