%0 Journal Article %T Non determinism through type isomorphism %A Alejandro D¨Şaz-Caro %A Gilles Dowek %J Electronic Proceedings in Theoretical Computer Science %D 2013 %I Open Publishing Association %R 10.4204/eptcs.113.13 %X We define an equivalence relation on propositions and a proof system where equivalent propositions have the same proofs. The system obtained this way resembles several known non-deterministic and algebraic lambda-calculi. %U http://arxiv.org/pdf/1303.7334v1