Acknowledgements Acknowledgements
I would like to acknowledge the authors (Robert A. Beezer, David Farmer, Alex Jordan, Mitchel T. Keller) of PreTeXt which is the tool used to author this web book.
I would like to acknowledge the MathWorks® Book Program for supporting the use of MATLAB® inside this book.
Finally, I would like to thank those students, attending my courses at University of Calabria, who reported typos and errors they found in the text. Any new reader, which will report errors using my personal email antonio.bilotta@unical.it, is already aknowledged from now.