(Ir)relevant T-norm Joint Distributions in the Arithmetic of Fuzzy Quantities

Irrelevance, a notion put forward in [5, 12], is a convenient tool to speed up computations in the arithmetic of interactive fuzzy numbers, which were first put forward in the seminal paper [3]. To make our point, below we deal with standard and less standard binary operations for fuzzy quantities whose interactivity is described by a t-norm joint distribution function.