| http://www.w3.org/ns/prov#value | - In 1981 Russel Ackoff wrote that a system is a set of two or more elements that satisfy the three conditions: the behaviour of each element has an effect on the behaviour of the whole; the behaviour of the elements and their effects on the whole are independent; and all sub-groups of elements have an effect on the behaviour of the whole, but none has an independent effect (Skyttner, 2005, p. 69).
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