“Proof theory” en anglès. Un bon llibre al respecteBook of Proofhttps://www.people.vcu.edu/~rhammack/BookOfProof/En versió PDFwww.people.vcu.eduhttps://www.people.vcu.edu/~rhammack/BookOfProof/Main.pdfHow to prove it - VellemanHow to Prove It A Structured Approach - Daniel J. Velleman.pdf2189.5KBAltresIntroduction to Higher Mathematicshttps://www.youtube.com/playlist?list=PLZzHxk_TPOStgPtqRZ6KzmkUQBQ8TSWVXIntroduction to higher mathematicsIntroduction to Higher Mathematicsby Patrick Keef and David Guichard Department of Mathematics Whitman Collegehttps://www.whitman.edu/mathematics/higher_math_online/Fundamentals of mathematicsFundamentals of Mathematicshttps://www.youtube.com/playlist?list=PLJmfLfPx1OedcIUn5nSCZQEtJrhLusB5Y
