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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
3*c+11/c+11 = 0
3*c^1+11*c^-1+11*c^0 = 0
(3*c^2+11*c^1+11*c^0)/(c^1) = 0 // * c^2
c^1*(3*c^2+11*c^1+11*c^0) = 0
c^1
3*c^2+11*c+11 = 0
3*c^2+11*c+11 = 0
DELTA = 11^2-(3*4*11)
DELTA = -11
DELTA < 0
c in { }
c belongs to the empty set
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