Editing Paul Dirac (section)

===Florida State University and University of Miami===
[[File:Paul Dirac Bust at FSU.jpg|thumb|upright|A bust of Paul Dirac at Florida State University]]
In 1969, Dirac was forced to retire from his chair at Cambridge, due to his age (67).<ref>{{Cite book |last=Kragh |first=Helge |url=https://pressbooks.pub/simplydirac/ |title=Simply Dirac |publisher=Simply Charly |year=2016 |isbn=978-1-943657-00-1 |edition=ebook |publication-date=April 29, 2016}}</ref> Before his retirement he was offered a visiting position at the [[University of Miami]] in [[Coral Gables, Florida]]; he accepted, joining its newly formed [[Center for Theoretical Studies, University of Miami|Center for Theoretical Studies]].<ref>{{Cite journal |date=April 1969 |title=Dirac Receives Miami Center Oppenheimer Memorial Prize |url=https://pubs.aip.org/physicstoday/article-abstract/22/4/127/426774/Dirac-Receives-Miami-Center-Oppenheimer-Memorial |journal=[[Physics Today]] |volume=22 |issue=4 |pages=127–128|doi=10.1063/1.3035512 }}</ref> In September 1970 he also accepted a visiting professor position at [[Florida State University]] in [[Tallahassee, Florida]], and moved his family to Tallahassee. He accepted a position at FSU as a full professor in 1972.<ref name="Diracmathshistory" /><ref>{{Cite web |last=Klopfenstein |first=Kelsey |date=2024-04-03 |title=How Paul Dirac's legacy brought a student from Nepal to FSU |url=https://news.fsu.edu/news/fsuglobal/2024/04/03/how-paul-diracs-legacy-brought-a-student-from-nepal-to-fsu/ |access-date=2024-07-29 |website=Florida State University News |language=en-US}}</ref>

Contemporary accounts of his time in Tallahassee describe it as happy, except that he apparently found the summer heat oppressive and liked to escape from it to Cambridge.<ref>{{cite web|url=https://www.famousscientists.org/paul-dirac/|title=Paul Dirac|website=Famous Scientists|date=13 October 2021 }}</ref> He would walk about a mile to work each day and was fond of swimming in one of the two nearby lakes (Silver Lake and Lost Lake), and was also more sociable than he had been at the [[University of Cambridge]], where he mostly worked at home apart from giving classes and seminars. At Florida State, he would usually eat lunch with his colleagues before taking a nap.<ref>{{Cite book|last=Pais|first=Abraham|url=https://books.google.com/books?id=Hm22wB0wGFcC|title=Paul Dirac: The Man and His Work|page=27|date=2009|publisher=Cambridge University Press|isbn=978-0-511-56431-4|oclc=958553083|via=Google Books}}</ref>

Dirac published over 60 papers at FSU during those last twelve years of his life, including a short book on general relativity.<ref>Baer, H. A., & Belyaev, A., eds., ''Proceedings of the Dirac Centennial Symposium'' (Singapore: World Scientific, 2003), [https://books.google.com/books?id=9RvJCgAAQBAJ&pg=PA3 p. 3].</ref> His last paper (1984), entitled "The inadequacies of quantum field theory," contains his final judgment on quantum field theory: "These rules of renormalisation give surprisingly, excessively good agreement with experiments. Most physicists say that these working rules are, therefore, correct. I feel that is not an adequate reason. Just because the results happen to be in agreement with observation does not prove that one's theory is correct." The paper ends with the words: "I have spent many years searching for a Hamiltonian to bring into the theory and have not yet found it. I shall continue to work on it as long as I can and other people, I hope, will follow along such lines."<ref>{{Cite book|last=Pais|first=Abraham|url=https://books.google.com/books?id=Hm22wB0wGFcC|title=Paul Dirac: The Man and His Work|page=28|date=2009|publisher=Cambridge University Press|isbn=978-0-511-56431-4|oclc=958553083|via=Google Books}}</ref>

In 1975, Dirac gave a series of five lectures at the [[University of New South Wales]] which were subsequently published as a book, ''Directions in Physics'' (1978). He donated the royalties from this book to the university for the establishment of Dirac Lecture Series. The [[Dirac Medal (UNSW)|Silver Dirac Medal for the Advancement of Theoretical Physics]] is awarded by the University of New South Wales to commemorate the lecture.<ref>{{cite web |url=http://www.phys.unsw.edu.au/ANNUAL_REPORTS/2004/school7.html |title=Dirac Medal awards |publisher=University of New South Wales |access-date=4 April 2013 |url-status=dead |archive-url=https://web.archive.org/web/20130412032421/http://www.phys.unsw.edu.au/ANNUAL_REPORTS/2004/school7.html |archive-date=12 April 2013 }}</ref>