The symmetric λμ-calculus is the λμ-calculus introduced by Parigot in which the reduction rule μ′, which is the symmetric of μ, is added. We give examples explaining why the technique using the usual candidates of reducibility does not work. We also prove a standardization theorem for this calculus. © 2005 Elsevier B.V. All rights reserved.
David, R., & Nour, K. (2005). Why the usual candidates of reducibility do not work for the symmetric λμ-calculus. In Electronic Notes in Theoretical Computer Science (Vol. 140, pp. 101–111). https://doi.org/10.1016/j.entcs.2005.06.020