Some sources state that Petri nets were invented in August 1939 by Carl Adam Petri-at the age of 13-for the purpose of describing chemical processes. A transition is enabled if all places connected to it as inputs contain at least one token. Place elements are depicted as white circles and transition elements are depicted as rectangles.Ī place can contain any number of tokens, depicted as black circles. A Petri net is a directed bipartite graph that has two types of elements, places and transitions. It is a class of discrete event dynamic system. One of several mathematical modeling systems for the description of distributed systemsĪ Petri net, also known as a place/transition (PT) net, is one of several mathematical modeling languages for the description of distributed systems.
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