Chaos in Chen's system with a fractional order

Chaos in Chen's system with a fractional order was discussed. By utilizing the fractional calculus techniques, it was found that chaos does exist in Chen's system with a fractional order and some phase diagrams were also constructed. Results show that Caputo derivative is preferred to Riemann-Liouville one. It was shown that Riemann-Liouville derivative and Caputo one are both equivalent under the same homogenous initial conditions.