This special issue is concerned with several modern research directions at the interplay between pure and applied nonlinear analysis. We welcome very good papers dealing with nonlinear problems driven either by differential equations or nonlocal fractional operators and considering the following topics:

1. qualitative, quantitative and/or bifurcation analysis of solutions;
2. blow-up and concentration properties of solutions;
3. singular or degenerate phenomena;
4. perturbation analysis and combined effects.

Submission Deadline: February 28, 2022

Guest Editor: Vicentiu Radulescu, Unviersity of Craiova & AGH University of Science and Technology

The ''Rendiconti del Circolo Matematico di Palermo'' is a mathematical journal that has a long and great history. The Managing Editors want to revive it and wish to bring it again to the old splendor. In particular, they decided to promote the realization of a number of high-level special thematic issues; among them, one in Algebraic Geometry, which they entrust to two distinguished algebraic geometers: Ciro Ciliberto and Alessandro Verra.  The theme for this issue is ''Rationality Problems''. As it is well known, this is a very classical and venerable topic, that is however always green, and in particular has recently seen spectacular developments. The best specialists in the field will be invited to contribute with a paper, that could either be a research or an expository one. The issue is planned to appear in 2022.

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As a result of the significant disruption that is being caused by the COVID-19 pandemic we are very aware that many researchers will have difficulty in meeting the timelines associated with our peer review process during normal times.  Please do let us know if you need additional time. Our systems will continue to remind you of the original timelines but we intend to be highly flexible at this time.