Probabilistic-valued decomposable set functions with respect to triangle functions

In the framework of the generalized measure theory the decomposable probabilistic-valued set functions are introduced with triangle functions $\tau$ in an appropriate probabilistic metric space as natural candidates for the "addition", leading to the concept of $\tau$-decomposable measures. Several set functions, among them the classical (sub)measures, previously defined $\tau_T$-submeasures, $\tau_{L,A}$-submeasures as well as recently introduced Shen's (sub)measures are described and investigated in a unified way. Basic properties and characterizations of $\tau$-decomposable (sub)measures are also studied and numerous extensions of results from the above mentioned papers are provided.