Talk:The Fabric of Reality

message: An internal link to the Simulated reality page has been added and then dropped.
It is actually quite relevant, since Deutsch discusses the subject in Fabric Of Reality.
(The current page is rather WP:POV, but that is a separate issue).
Also, the omission of any link to Quantum computing is puzzling, since Deutsch is an acknowledged expert in the field.1Z 15:57, 18 January 2007 (UTC)
thread_title:  See also: simulated reality 

message: It is not clear from the article why is the creation paradox not possbile from within parallel worlds. the knowledge is created in one, and then is transmitted to another. This inconsistency in the article must be resolved. --Procrastinating@talk2me 13:30, 1 October 2007 (UTC)
thread_title:  knowledge paradox, request for clarification 

message: I was surprised to find no discussion of how the book was received by others in the field.  I recently read it and was surprised by certain aspects of it, which I would not have expected to have passed silently in the scientific community: 
*The strawman argument with the character Deutsch labels a "crypto-intuitionist";
*Circular argument against solipsism;
*What strikes me as multiple leaps of logic, e.g., that the interference effect must be a product of alternate universes, or that there must be intelligence up to the very instant of the end of the universe;
*The condescending treatment of anyone who doesn't accept the alternate-universe model (e.g., that such scientists are "clinging" to older models)
I would expect that these sorts of things would have resulted in responses from other people in the field, and would expect to see that reflected here.  Does anyone know if the book, or Deutsch's views put forth in it, generated any commentary? TJRC (talk) 21:53, 8 September 2008 (UTC)
replies: text: I don't know, but this is a peculiar book in that it's obviously intended for general readers (that is, non-scientists), yet its clear intention is to make a case for an unestablished theory. Most popular scientific books either present established science or if they present controversial ideas do so not as advocates; they explain various contending theories and deal with them even-handedly. So "other field people in the field" may not have formally critiqued this merely because it doesn't address them. It's hard for me to imagine, however, that physicists appreciated Deutsch's attempt to rally the public and pressure the scientific community from without. (And yes, the book is riddled with logical solecism and disingenuous argument.) TheScotch (talk) 03:48, 5 January 2012 (UTC)
thread_title:  Criticism & reception? 

message: With apologies to the original author, this article is confusing, difficult to read, and sounds like random selections of someone's study notes. It includes much too much detail, too many buzz-words and is not meaningful to someone who hasn't read the book. (Assuming that the book is meaningful!)
I hesitate to attack it with an axe :) but I think it would be a much better article if it had 1/10 of the detail. I've listed it for cleanup and will come back and see what's happened and what I can add.Drpixie (talk) 11:22, 7 October 2008 (UTC)
replies: text: I, for one, would not object to you attacking it with an axe. TJRC (talk) 19:11, 7 October 2008 (UTC)
thread_title:  Cleanup 

message: "With considerable thrust concentrated position" -- shouldn't there be a hyphen in there somewhere? Paul Magnussen (talk) 17:04, 31 March 2010 (UTC)
thread_title:  Thrust concentrated position 

message: Any ideas how to fix this wording : "His theory of everything is (weakly) emergentist  ..."? Slightsmile (talk) 01:53, 6 June 2010 (UTC)
thread_title:  weakly 

message: This book had a big effect on me and I have read it several times over the years, tho I do not have it to hand so am commenting by memory.
Article is full of grand technical terms that may be correct but are confusing to the general reader. Furthermore it seems to miss the important themes of the book.
=== The book is called "The Fabric of Reality". ===
Therefore the main theme is that "reality consist of more than visible and tangible matter". It denies simplistic materialism. It argues that immaterial things, like mathematics, have real existence though in a different way than matter. His "mathematics" probably includes things like Logic, and the Laws of Nature, which govern/describe how matter behaves.
Subordinate Themes:-
==== 1) Scientific Theories are best regarded as explanations.  ====
Philosophers keep getting tangled up trying to prove scientific theories using pure logic alone, without any basis of facts. Viewing them as explanations instead brings many advantages, such as the ability to choose the simplest theory that fits the evidence.
As an example, he demolishes Solipsism. Solipsism is generally supposed to be irrefutable, on the grounds that if everything is a dream, then so are the results of any test one could do.
Deutsch refutes that by taking the theory seriously (as he says) and thinking out the ramifications. How is it that everything (specifically all fields of science) forms a consistent whole, even things one does not yet know? How do other, imaginary people know things that you do not? How can they have skills that you cannot equal? 
The end result is that you have a theory which includes all the complexity of the apparent world, plus an additional notion that it is the dream of a single entity. Thus it is actually a more complicated theory, not a simpler one.
==== 2) Abstractions such as Mathematics are real tho immaterial.====
Deutsch argues that Mathematics has an independent existence "outside" our heads. It is resistant, contains surprises, develops in unexpected ways. It does not conform to our imagination or wishes.
==== 3) Interference Effects of single quanta imply the "Many Worlds" Multiverse. ====
The two slit experiment shows interference effects even using single electrons or photons. Since a material particle can only pass thru one of the slits, how can it "know" about the other in order to land in some places and avoid others? Deutsch argues thus: an electron in our universe passes thru one slit; an identical electron in a nearby universe passes thru the other slit. These two electrons interfere with each other and thereby produce the interference of light/dark bands.
[Naughty aside : this is not the only explanation possible. 
See Richard Feynman - Science Videos at http://vega.org.uk/video/subseries/8 . 
In the second video he emphasises that there is no wave-particle duality ::- that "waviness" is a property of many quantum interactions. He could have followed the mathematics further and said that "particleness" is also a property of many quantum interactions. A single particle can only travel thru one slit, but a quantum can and does pass thru both. Indeed the mathematics implies that a quantum travels every possible path simultaneously. In his book "QED The Strange Theory of Light and Matter" he explicitly states that photons travel at various speeds, they are not fixed to the speed of light. The waves and particles we are familiar with are emergent properties of large numbers of interacting quanta. Being unfamiliar to our macroscopic senses, quanta behave in ways that seem crazy but are described by mathematics to great accuracy.
This sticks closer to Deutsch's assertion that maths is real: if the maths says it is this way, then that is how it really is. No need for the extra assumption of parallel universes. But this is naughty - my opinion only, not the book. ]
==== 4) Quantum Computing ====
Assuming the multiverse of interfering quanta, quantum computations actually run inside many or all the universes and thereby produce results that would be impossible within a single universe.
==== 5) Time does not exist ====
The multiverse consists of a large number (understatement) of instantaneous snapshots of each universe. But there is no way to order them to make a time sequence.
==== 6) Virtual Reality ====
Deutsch argues that the fact - that virtual reality is possible - is itself a significant part of reality. Thus reality consists of : matter, mathematics and virtual reality.
[ Personal aside :: 5) and 6) are where he lost me. First few times I read the book I nodded with agreement, but afterwards could never remember the importance of Virtual Reality. On the most recent reading, I noticed that here Deutsch turned philosophical, and that's why I could not follow him. He commits all the mistakes that I associate with philosophy : gaps in the logic; not keeping the various meanings of a complex topic clearly separate; drifting from one meaning to another without noticing; and so on. ]
==== 6) Don't remember the following themes.. ====
cos they are philosophical too. :-( 
Mea culpa.
Allxuqep (talk) 10:02, 20 July 2012 (UTC)
thread_title:  Appalling : Misses the Point of the Book 

message: Therefore the main theme is that "reality consist of more than visible and tangible matter". It denies simplistic materialism. It argues that immaterial things, like mathematics, have real existence though in a different way than matter. His "mathematics" probably includes things like Logic, and the Laws of Nature, which govern/describe how matter behaves.
Subordinate Themes:-
==== 1) Scientific Theories are best regarded as explanations.  ====
Philosophers keep getting tangled up trying to prove scientific theories using pure logic alone, without any basis of facts. Viewing them as explanations instead brings many advantages, such as the ability to choose the simplest theory that fits the evidence.
As an example, he demolishes Solipsism. Solipsism is generally supposed to be irrefutable, on the grounds that if everything is a dream, then so are the results of any test one could do.
Deutsch refutes that by taking the theory seriously (as he says) and thinking out the ramifications. How is it that everything (specifically all fields of science) forms a consistent whole, even things one does not yet know? How do other, imaginary people know things that you do not? How can they have skills that you cannot equal? 
The end result is that you have a theory which includes all the complexity of the apparent world, plus an additional notion that it is the dream of a single entity. Thus it is actually a more complicated theory, not a simpler one.
==== 2) Abstractions such as Mathematics are real tho immaterial.====
Deutsch argues that Mathematics has an independent existence "outside" our heads. It is resistant, contains surprises, develops in unexpected ways. It does not conform to our imagination or wishes.
==== 3) Interference Effects of single quanta imply the "Many Worlds" Multiverse. ====
The two slit experiment shows interference effects even using single electrons or photons. Since a material particle can only pass thru one of the slits, how can it "know" about the other in order to land in some places and avoid others? Deutsch argues thus: an electron in our universe passes thru one slit; an identical electron in a nearby universe passes thru the other slit. These two electrons interfere with each other and thereby produce the interference of light/dark bands.
[Naughty aside : this is not the only explanation possible. 
See Richard Feynman - Science Videos at http://vega.org.uk/video/subseries/8 . 
In the second video he emphasises that there is no wave-particle duality ::- that "waviness" is a property of many quantum interactions. He could have followed the mathematics further and said that "particleness" is also a property of many quantum interactions. A single particle can only travel thru one slit, but a quantum can and does pass thru both. Indeed the mathematics implies that a quantum travels every possible path simultaneously. In his book "QED The Strange Theory of Light and Matter" he explicitly states that photons travel at various speeds, they are not fixed to the speed of light. The waves and particles we are familiar with are emergent properties of large numbers of interacting quanta. Being unfamiliar to our macroscopic senses, quanta behave in ways that seem crazy but are described by mathematics to great accuracy.
This sticks closer to Deutsch's assertion that maths is real: if the maths says it is this way, then that is how it really is. No need for the extra assumption of parallel universes. But this is naughty - my opinion only, not the book. ]
==== 4) Quantum Computing ====
Assuming the multiverse of interfering quanta, quantum computations actually run inside many or all the universes and thereby produce results that would be impossible within a single universe.
==== 5) Time does not exist ====
The multiverse consists of a large number (understatement) of instantaneous snapshots of each universe. But there is no way to order them to make a time sequence.
==== 6) Virtual Reality ====
Deutsch argues that the fact - that virtual reality is possible - is itself a significant part of reality. Thus reality consists of : matter, mathematics and virtual reality.
[ Personal aside :: 5) and 6) are where he lost me. First few times I read the book I nodded with agreement, but afterwards could never remember the importance of Virtual Reality. On the most recent reading, I noticed that here Deutsch turned philosophical, and that's why I could not follow him. He commits all the mistakes that I associate with philosophy : gaps in the logic; not keeping the various meanings of a complex topic clearly separate; drifting from one meaning to another without noticing; and so on. ]
==== 6) Don't remember the following themes.. ====
cos they are philosophical too. :-( 
Mea culpa.
Allxuqep (talk) 10:02, 20 July 2012 (UTC)
thread_title:  The book is called "The Fabric of Reality". 

message: cos they are philosophical too. :-( 
Mea culpa.
Allxuqep (talk) 10:02, 20 July 2012 (UTC)
thread_title:  6) Don't remember the following themes.. 

message: The following says that "coherent worlds" was been mentioned above. Maybe it was there at some point, but perhaps it was deleted. I don't see it. It should be added back or the "mentioned above" part deleted. 
4.An interesting point which perhaps relies on the "coherent worlds" approach mentioned above.
Alexepascual (talk) 20:04, 23 July 2012 (UTC)
thread_title:  Coherent Worlds 

message: After the section outlining the book's position on MWI, there appears to be an attempt at a rebuttal/commentary on each point. The first point says:
"The situation of having multiple interpretations of quantum mechanics is anomalous. People should settle for the most straightforward (realistic) interpretation, which is, according to Deutsch, Many Worlds."
and the 'However' section says:
"The interpretational debate is not unprecedented. There was a debate about the nature of gravity and action-at-a-distance in Newtonian physics. There is a debate about the ontology of space in relativity theory. There is even a debate about the ontology of mathematics."
How is the fact that there have been previously been debates about interpretation a counter to the point?
Ubermammal (talk) 12:25, 4 September 2012 (UTC)
thread_title:  "Debate is not unprecedented" 

message: This article is junk and should be deleted or half of it removed. There is either entirely unsourced or original content rebuttals or quips about the content of the book, that quite frankly need to be fixed or removed.  — Preceding unsigned comment added by 76.19.102.88 (talk) 15:35, 11 February 2013 (UTC)
thread_title:  Junk Article 

message: I've chanced back on this article after a long time, and it's still a very poor page. The book obviously impressed some people, but the article doesn't even hint that this book is in any way notable. Everything after the initial Overview paragraph is very poor content - not notable, doesn't explain or summarise, apparently personal opinions, not referenced (at least not with respect to the book), and confusing. I hesitate to start an edit war, but wikipedia would be better without the page, or if the page was just a stub. I'll nominate the article for deletion - maybe someone would like to make it more encyclopaedic, or maybe we delete it. Drpixie (talk) 23:42, 1 September 2015 (UTC)
thread_title:  Nominate for Deletion 

message: This article needs a reception/criticism section. Thriley (talk) 09:24, 23 October 2013 (UTC)
thread_title: Establishment