Abstract
In recent literature there are an increasing number of papers where the forbidden sets (FSs) of difference equations are computed. We review and complete different attempts to describe the FS and propose new perspectives for further research and a list of open problems in this field.
Funding
This paper has been partially supported by Grant [grant number MTM2008-03679] from Ministerio de Ciencia e Innovacón (Spain), [Project number 08667/PI-08] Fundación Séneca de la Comunidad Autónoma de la Región de Murcia (Spain).
We thank the anonymous referees for their suggestions and comments.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes
1. Email: [email protected].