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The first goal of this work is to extend a model of Timed Safe Petri Nets to allow the treatment of preference between transitions. In the proposed Possibilistic Timed Safe Petri Net, we attach a duration to each transition, which can be precise, imprecise, or fuzzy, accounting for the maximal amoun
Processes of timed Petri nets are represented by labelled partial orders with some extra features. These features re ect the execution times of processes and allow to combine processes sequentially and in parallel, which leads to some algebras. The processes can be represented either without specify
## TIMED PETRI NETS Petri nets were developed as an operational formalism for specifying untimed concurrent systems. They can show concurrent activities by depicting control and data flows in different parts of the modeled system. As an operational formalism, a Petri net gives a dynamic representa