Monotonicity Results for Delta and Nabla Caputo and Riemann Fractional   Differences via dual identities
  Recently, some authors have proved monotonicity results for delta and nabla fractional differences separately. In this article, we use dual identities relating delta and nabla fractional difference operators to prove shortly the monotonicity properties for the (left Riemann) nabla fractional differences using the corresponding delta type properties. Also, we proved some monotonicity properties for the Caputo fractional differences. Finally, we use the $Q-$operator dual identities to prove monotonicity results for the right fractional difference operators. 
Thabet Abdeljawad, Baahaaeldin Abdalla
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