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subject > event > computation

computation
subject			fact

computation	can be represented by a state diagram
	is a subtopic of 8.2 - State Diagrams
	is a kind of event
event	can cause a system or object to change from one state to another

Kinds of computation :

• action^2 (8 facts) - Something that takes place effectively instantaneously when a transition occurs in a state diagram, or upon entry or exit from a state
• activity (4 facts) - Something that occurs over a period of time and takes place while the system is in a state