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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
(3/3)*v+6/v+1+3 = 0
1*v^1+6*v^-1+4*v^0 = 0
(1*v^2+4*v^1+6*v^0)/(v^1) = 0 // * v^2
v^1*(1*v^2+4*v^1+6*v^0) = 0
v^1
v^2+4*v+6 = 0
v^2+4*v+6 = 0
DELTA = 4^2-(1*4*6)
DELTA = -8
DELTA < 0
v in { }
v belongs to the empty set
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