Fuzzy functions: a fuzzy extension of the category SET and some related categories Ulrich Höhle | Hans-E. Porst | Alexander P. Sostak | Show more Ulrich Höhle Germany Bergische Universität Hans-E. Porst Germany University of Bremen Alexander P. Sostak Latvia University of Latvia Submitted: 2014-05-27 | Accepted: 2014-05-27 | Published: 2000-10-01 DOI: https://doi.org/10.4995/agt.2000.3028