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D( m )
m-2 = 0
m = 0
m-2 = 0
m-2 = 0
m-2 = 0 // + 2
m = 2
m = 0
m = 0
m in (-oo:0) U (0:2) U (2:+oo)
m/(m-2)-(4/m) = 0
m/(m-2)-4*m^-1 = 0
m/(m-2)-4/m = 0
(m^2)/(m*(m-2))+(-4*(m-2))/(m*(m-2)) = 0
m^2-4*(m-2) = 0
m^2-4*m+8 = 0
m^2-4*m+8 = 0
m^2-4*m+8 = 0
DELTA = (-4)^2-(1*4*8)
DELTA = -16
DELTA < 0
1 = 0
1/(m*(m-2)) = 0
1/(m*(m-2)) = 0 // * m*(m-2)
1 = 0
m belongs to the empty set
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