Nonlinearity is a system behavior characteristic in which the output is not directly proportional to the input, distinguishing it from linear relationships by exhibiting disproportionate, unpredictable, or emergent responses to changes in initial conditions or system parameters.
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Testing for nonlinearity in time series: the method of surrogate data
James Theiler, Stephen Eubank, André Longtin et al. · Physica D Nonlinear Phenomena · 1992 · 3.8K citations
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Centre National de la Recherche Scientifique
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Australian National University
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