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Petri Nets
Are closely related to data flow graphs
The main distinction is that the graphs are bipartite, made up of a set of places and transitions
Useful for concurrent, asynchronous, distributed, parallel, and nondeterministic systems.
Each type of node can be further subdivided into subtypes
annihilator
generator
trivial transition
splitting
collection
terminal place
initial place
trivial place
branching
junction
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