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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
2*m+4/m-2+2 = 0
2*m^1+4*m^-1 = 0
(2*m^2+4*m^0)/(m^1) = 0 // * m^2
m^1*(2*m^2+4*m^0) = 0
m^1
2*m^2+4 = 0
2*m^2+4 = 0
DELTA = 0^2-(2*4*4)
DELTA = -32
DELTA < 0
m in { }
m belongs to the empty set
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