recently established {see the work of Kou and Xia [Stud. Appl. Math. 141 (1), 3–45 (2018)]}.
They observed some profound differences between QDEs and ordinary differential
equations. Also, an algorithm to evaluate the fundamental matrix by employing the
eigenvalues and eigenvectors was presented in the work of Kou and Xia [Stud. Appl. Math.
141 (1), 3–45 (2018)]. However, the fundamental matrix can be constructed providing that …