Romano Guardini Felix Messerschmid, Heinrich Getzeny, Rudolf Schwarz, Jean Gebser, Joseph Ratzinger (later Pope Benedict XVI), and Jorge Mario Bergoglio (later Pope Francis). In the 1980s Bergoglio began work on a doctoral dissertation on Guardini, though he never completed it. Pope Francis cited Guardini's "The End of the Modern World" eight times in his 2015 encyclical "Laudato si'", more often than any other modern thinker who was not pope. Hannah Arendt and Iring Fetscher were favourably impressed by Guardini's work. He had a strong influence in Central Europe; in Slovenia, for example, an influential group of Christian socialists, among whom Edvard Kocbek,
Jorge Luis Borges and mathematics Jorge Luis Borges and mathematics Jorge Luis Borges and mathematics concerns several modern mathematical concepts found in certain essays and short stories of Argentinian author Jorge Luis Borges (1899-1986), including concepts such as set theory, recursion, chaos theory, and infinite sequences, although Borges' strongest links to mathematics are through Georg Cantor's theory of infinite sets, outlined in "The Doctrine of Cycles" ("La doctrina de los ciclos"). Some of Borges' most popular works such as "The Library of Babel" ("La Biblioteca de Babel"), "The Garden of Forking Paths" ("El Jardín de Senderos que se Bifurcan"), "The Aleph" ("El Aleph"), an allusion