Nonexistence of global solutions for a fractional differential problem

In this paper, we study the non-existence of non-trivial global solutions for a fractional differential inequality containing a lower order fractional derivative and a polynomial source term on the right hand side. Non-existence of non-trivial global solutions result is proved in an appropriate space by means of the test-function method. The range of values of the exponent involved there (ensuring non-existence) is found to depend only on the lower order derivative. This is in agreement with the integer order case. Numerical examples are given to illustrate the results.