Based on the generalized Riccati transformation technique and some inequality, we study some oscillation behaviour of solutions for a class of a discrete nonlinear fractional-order derivative equation
Δ
[
γ
(
ℓ
)
[
α
(
ℓ
)
+
β
(
ℓ
)
Δ
μ
u
(
ℓ
)
]
η
]
+
ϕ
(
ℓ
)
f
[
G
(
ℓ
)
]
=
0
,
ℓ
∈
N
ℓ
0
+
1
−
μ
,
\[\Delta [\gamma (\ell ){[\alpha (\ell ) + \beta (\ell ){\Delta ^\mu }u(\ell )]^\eta }] + \phi (\ell )f[G(\ell )] = 0,\ell \in {N_{{\ell _0} + 1 - \mu }},\]
where
ℓ
0
>
0
,
G
(
ℓ
)
=
∑
j
=
ℓ
0
ℓ
−
1
+
μ
(
ℓ
−
j
−
1
)
(
−
μ
)
u
(
j
)
\[{\ell _0} > 0,\quad G(\ell ) = \sum\limits_{j = {\ell _0}}^{\ell - 1 + \mu } {{{(\ell - j - 1)}^{( - \mu )}}u(j)} \]
and Δ
μ
is the Riemann-Liouville (R-L) difference operator of the derivative of order μ, 0 < μ ≤ 1 and η is a quotient of odd positive integers. Illustrative examples are given to show the validity of the theoretical results.