Muglia, Luigi2012-11-092012-11-092012-11-09http://hdl.handle.net/10955/80Tesi di dottorato di ricerca in Matematica e informatica, XVII cicloIn this Ph.D thesis we study the following topics related to fixed point theory: (A) Existence of solutions for integro-differential systems with or without impulses. (B) The optimal retraction problem and minimal displacement problem.enAnalisi MatematicaThesis