petri net
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A Petri net (also known as a place/transition net or P/T net) is one of several mathematical modeling languages for the description of distributed systems. A Petri net is a directed bipartite graph, in which the nodes represent transitions (i.e. events that may occur, signified by bars) and places (i.e. conditions, signified by circles). The directed arcs describe which places are pre- and/or postconditions for which transitions (signified by arrows) occurs. 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. Like industry standards such as Unified Modeling Language|UML activity diagrams, BPMN and Event-driven process chain|EPCs, Petri nets offer a diagram|graphical notation for stepwise processes that include choice, iteration, and Concurrent computing|concurrent execution. Unlike these standards, Petri nets have an exact mathematical definition of their execution...
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