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m in (-oo:+oo)
(1/4)*m^2-m+1/2 = 0
1/4*m^2-m+1/2 = 0
DELTA = (-1)^2-(1/4*1/2*4)
DELTA = 1/2
DELTA > 0
m = ((1/2)^(1/2)+1)/(1/4*2) or m = (1-(1/2)^(1/2))/(1/4*2)
m = 2*((1/2)^(1/2)+1) or m = 2*(1-(1/2)^(1/2))
m in { 2*(1-(1/2)^(1/2)), 2*((1/2)^(1/2)+1) }
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