Apparent Singularities of D-finite Systems [article]

Shaoshi Chen, Manuel Kauers, Ziming Li, Yi Zhang
2017 arXiv   pre-print
We generalize the notions of singularities and ordinary points from linear ordinary differential equations to D-finite systems. Ordinary points of a D-finite system are characterized in terms of its formal power series solutions. We also show that apparent singularities can be removed like in the univariate case by adding suitable additional solutions to the system at hand. Several algorithms are presented for removing and detecting apparent singularities. In addition, an algorithm is given for
more » ... computing formal power series solutions of a D-finite system at apparent singularities.
arXiv:1705.00838v1 fatcat:o6rk3flp55hele7r3k3r7fgvou