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Variable sets

A variable set is the collection $\Omega$ of all the possible outcomes $\omega$ of a system and is composed by $n$ unidimensional variables, that is $\Omega=\{X_1,X_2,...,X_n\}$ with $X_i$ beeing a one dimensional variable. ProBT represents variable sets by the abstract class plVariableSet. Variables sets are classified in single type and multiple type.