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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
3/b < 26 // - 26
3/b-26 < 0
3*b^-1 < 26
3*b^-1 < 26 // : 3
b^-1 < 26/3
1/(b^1) < 26/3
b <> 0
1/(b^1) < 26/3 // * b^2
(b^2)/(b^1) < 26/3*b^2
b^1 < 26/3*b^2
b-26/3*b^2 < 0
b^1*(1-26/3*b) < 0
b < 0
-(abs(b))^1*(26/3*(abs(b))^1+1) < 0 // : -(abs(b))^1
26/3*(abs(b))^1+1 > 0
26/3*(abs(b))^1 > -1 // : 26/3
(abs(b))^1 > -1/26/3
(abs(b))^1 > -3/26 // ^ 1/1
abs(b) > (-3/26)^(1/1)
abs(b) > -3/26
b in (-oo:0)
b < 0
b > 0
b^1*(1-(26/3*b^1)) < 0 // : b^1
1-(26/3*b^1) < 0
1 < 26/3*b^1 // : 26/3
1/26/3 < b^1 // ^ 1/1
(1/26/3)^(1/1) < b
b in (3/26:+oo)
b > 0
b in (-oo:0) U (3/26:+oo)
b in (-oo:0) U (3/26:+oo)
(-oo:0) U (3/26:+oo)
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