Is non-linearity incontrovertible? What about hidden variables?

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Discussion Overview

The discussion revolves around the nature of non-linear systems and their relationship to linear equations. Participants explore whether non-linear systems can be modeled or approximated using linear equations, and the implications of such modeling on understanding non-linearity.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Some participants propose that non-linear systems do not obey the superposition principle and question if they can be modeled from an underlying set of linear equations.
  • One participant suggests that a non-linear system can always be approximated by a sufficiently complicated linear system, but notes that this approximation may not hold for all non-linear systems.
  • Another participant emphasizes that some non-linear systems exhibit behaviors that cannot be captured by any linear approximation, indicating limitations in linear analysis.
  • A later reply humorously suggests increasing the complexity of the model by parameterizing the curve further.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between non-linear and linear systems, with some suggesting approximation is possible while others assert that certain non-linear behaviors cannot be approximated linearly. The discussion remains unresolved regarding the extent to which non-linear systems can be modeled by linear equations.

Contextual Notes

There are limitations regarding the assumptions made about the nature of non-linear systems and the definitions of linearity and non-linearity. The discussion does not resolve the mathematical steps involved in modeling these systems.

kmarinas86
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Some systems are said to not obey the superposition principle. This is because certain relations are found which are not arrived at by simple addition or subtraction. However, I wonder if some "non-linear systems" can be modeled directly from an underlying set of linear equations. Now, I don't assume that such a set of equations would be finite. One must somehow generate such equations, though not necessarily by using a system of non-linear equations. Is it possible? If so, can such a process theoretically apply to all non-linear systems?
 
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You can always approximate a non-linear system by a sufficiently complicated linear system. Is that what you mean?
 
HallsofIvy said:
You can always approximate a non-linear system by a sufficiently complicated linear system.

As long as one remembers that approximate in this case means that there are non-linear system whose behavior cannot be approximated by any (piece-wise) linear approximation of the field. Or in other words, some non-linear systems have behavioral characteristics that will escape any analysis based on linear theory.
 
Paramertize the curve 10 more times!
 

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