In Mathematical Programming 2003, Gomory and Johnson conjecture that the facets of the infinite group problem are always generated by piecewise linear functions. In this paper we give an example showing that the Gomory-Johnson conjecture is false.
['Amitabh Basu', 'Michele Conforti', 'Gérard Cornuéjols', 'Giacomo Zambelli']
A counterexample to a conjecture of Gomory and Johnson