W. R. ASHBY thus describes the ultrastable systems behavior: "(it) acts selectively towards the fields of the main variables, rejecting those that lead the representative point to a critical state but retaining those that do not" (1958, p.91).
In other words, the ultrastable system remains within the limits of a basin or vecinity defined by a stable attractor.
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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