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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
16 < 18/y // - 18/y
16-(18/y) < 0
16-18*y^-1 < 0
-18*y^-1 < -16
-18*y^-1 < -16 // * -1
18*y^-1 > 16
18*y^-1 > 16 // : 18
y^-1 > 16/18
y^-1 > 8/9
1/(y^1) > 8/9
y <> 0
1/(y^1) > 8/9 // * y^2
(y^2)/(y^1) > 8/9*y^2
y^1 > 8/9*y^2
y-8/9*y^2 > 0
y^1*(1-8/9*y) > 0
y < 0
-(abs(y))^1*(8/9*(abs(y))^1+1) > 0 // : -(abs(y))^1
8/9*(abs(y))^1+1 < 0
8/9*(abs(y))^1 < -1 // : 8/9
(abs(y))^1 < -1/8/9
(abs(y))^1 < -9/8 // ^ 1/1
abs(y) < (-9/8)^(1/1)
abs(y) < -9/8
y belongs to the empty set
y < 0
y > 0
y^1*(1-(8/9*y^1)) > 0 // : y^1
1-(8/9*y^1) > 0
1 > 8/9*y^1 // : 8/9
1/8/9 > y^1 // ^ 1/1
(1/8/9)^(1/1) > y
y in (0:9/8)
y > 0
y in (0:9/8)
y in (0:9/8)
(0:9/8)
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