Supernova implosion-explosion in the light of catastrophe theory Pierre-Henri Chavanis, Bruno Denet, Martine Le Berre and Yves Pomeau Eur. Phys. J. B, 92 12 (2019) 271 Published online: 18 December 2019 DOI: 10.1140/epjb/e2019-100435-6