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Notes
- 1.
A fuller description is given here: http://www.mth.uct.ac.za/~ellis/cos0.html.
- 2.
For a comprehensive discussion, see the many links on Denis Noble’s webpage at http://musicoflife.co.uk/.
- 3.
This derivation does not refer to the time irreversibility of the weak interaction, which has no direct effect on everyday life: it cannot be the source of the arrow of time in physical chemistry and biology.
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Appendix: Equivalence Classes
Appendix: Equivalence Classes
The key idea is that of functional equivalence classes. Whenever you can identify existence of such equivalence classes, that is an indication that top-down causation is taking place [4]. Indeed this is essentially the ontological nature of the higher level effective entity: a computer program is in its nature the same as the set of all possible implementations of the set of logical operations it entails. These are what enter into the higher level effective relations; they can be described in many different ways, and implemented in many different ways; what remains the same in those variants is the core nature of the entity itself.
An equivalence relation is a binary relation \(\sim \) satisfying three properties:
-
1.
For every element \(a\) in \(X\), \(a \sim a\) (reflexivity),
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2.
For every two elements \(a\) and \(b\) in \(X\), if \(a \sim b\), then \(b \sim a\) (symmetry), and
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3.
For every three elements \(a\), \(b\), and \(c\) in \(X\), if \(a \sim b\) and \(b \sim c\), then \(a \sim c\) (transitivity).
The equivalence class of an element \(a\) is denoted \([a]\) and may be defined as the set of elements that are related to \(a\) by \(\sim \).
The way this works is illustrated in (Figs. 3.1 and 3.2) higher level states H1 can be realised via various slower level states L1. This may or may not result in coherent higher level action arising out of the lower level dynamics.
When coherent dynamics emerges, the set of all lower states corresponding to a single higher level state form an equivalence class as far as the higher level actions are concerned. They are indeed the effective variables that matter, rather than the specific lower level state that instantiates the higher level one. This is why lower level equivalence classes are the key to understanding the dynamics (Figs. 3.1).
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Ellis, G. (2015). Recognising Top-Down Causation. In: Aguirre, A., Foster, B., Merali, Z. (eds) Questioning the Foundations of Physics. The Frontiers Collection. Springer, Cham. https://doi.org/10.1007/978-3-319-13045-3_3
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