% acknowledgements
\textit{In this section, I want to thank all the people who have supported me during these years of study and throughout the preparation of this thesis. Without their help, encouragement, and presence, this work would not have been possible.}

I would like to express my deepest gratitude to my supervisor, Prof. Alessandro SAVINO, for his guidance, support, and encouragement throughout the development of this work. His insights and advice have been invaluable in shaping this thesis.  

I am sincerely thankful to my family for their unconditional love, patience, and support during these years. Their encouragement has given me the strength to face challenges and pursue my goals.  

Finally, I would like to thank all the people who have been close to me during this journey, whose presence and kindness have made this period of my life truly meaningful.  


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