About the logo

Research Group on Graph Theory and Combinatorics

This logo is a combinatorial machine designed by the medieval philosopher Ramon Llull (Raimundus Lullius; Majorca 1235 - 1316). Llull wrote more than 200 books in Catalan, Arabic and Latin about poetry, language, religion, philosophy etc. He was a great traveller and visited several European and North African cities. He teached at different places including the University of Paris. His combinatorial wheels had some influence in the work of Leibniz on formal logics Dissertio de Arte Combinatoria. More on Ramon Llull in: Martin Gardner, Logic Machines and Diagrams, 2nd edition, University of Chicago Press, 1982 and the recent paper "The Lull before the storm: Combinatorics and religion in the Renaissance" by John Fauvel and Robin J. Wilson; Bulletin of the ICA, 11 (1994), pp. 49-58. The biography is taken from this web page.