Condensation transition and ensemble inequivalence in the discrete nonlinear Schrödinger equation Giacomo Gradenigo, Stefano Iubini, Roberto Livi and Satya N. Majumdar Eur. Phys. J. E, 44 3 (2021) 29 Published online: 12 March 2021 DOI: 10.1140/epje/s10189-021-00046-5