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D( f )
f = 0
f = 0
f = 0
f in (-oo:0) U (0:+oo)
5/f > 12 // - 12
5/f-12 > 0
5*f^-1 > 12
5*f^-1 > 12 // : 5
f^-1 > 12/5
1/(f^1) > 12/5
f <> 0
1/(f^1) > 12/5 // * f^2
(f^2)/(f^1) > 12/5*f^2
f^1 > 12/5*f^2
f-12/5*f^2 > 0
f^1*(1-12/5*f) > 0
f < 0
-(abs(f))^1*(12/5*(abs(f))^1+1) > 0 // : -(abs(f))^1
12/5*(abs(f))^1+1 < 0
12/5*(abs(f))^1 < -1 // : 12/5
(abs(f))^1 < -1/12/5
(abs(f))^1 < -5/12 // ^ 1/1
abs(f) < (-5/12)^(1/1)
abs(f) < -5/12
f belongs to the empty set
f < 0
f > 0
f^1*(1-(12/5*f^1)) > 0 // : f^1
1-(12/5*f^1) > 0
1 > 12/5*f^1 // : 12/5
1/12/5 > f^1 // ^ 1/1
(1/12/5)^(1/1) > f
f in (0:5/12)
f > 0
f in (0:5/12)
f in (0:5/12)
(0:5/12)
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