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In this study, we consider the three dimensional $\alpha$-fractionalnonlinear delay differential system of the form  \begin{eqnarray*}  D^{\alpha}\left(u(t)\right)&=&p(t)g\left(v(\sigma(t))\right),\\D^{\alpha}\left(v(t)\right)&=&-q(t)h\left(w(t))\right),\\D^{\alpha}\left(w(t)\right)&=& r(t)f\left(u(\tau(t))\right),~ t \geq t_0,  \end{eqnarray*}  where $0 < \alpha \leq 1$, $D^{\alpha}$ denotes the Katugampola fractionalderivative of order $\alpha$. We have established some new oscillation criteriaof solutions of differential system by using generalized Riccati transformationand inequality technique. The obtained results are illustrated with suitableexamples.

On the Oscillation of Three Dimensional Katugampola Fractional Delay Differential Systems