|Motion: spatial variation of one or more observed or not observed objects in time. Problems arising in connection with attribution or withdrawal of predicates. See also change, temporal identity, process, flux, vectors._____________Annotation: The above characterizations of concepts are neither definitions nor exhausting presentations of problems related to them. Instead, they are intended to give a short introduction to the contributions below. – Lexicon of Arguments. |
David Deutsch on Motion - Dictionary of Arguments
Change/Motion: discrete variables do not occur in classical physics. How can you get from zero to one? In classical physics you have to jump unsteadily, this is not compatible with how forces and movements work in mechanics ((s) in between the current is switched off).
Discontinuous change is not necessary in quantum physics. Before the change it has the value zero in all universes. After the change, it has the value 1 in all universes. During the change, the fraction of universes in which the value is zero decreases steadily from 100 percent to 0, and vice versa.
At the level of the multiverse, the motion is objectively continuous - subjectively, from the perspective of a single universe, it is unsteady.
Motion: the idea that something moves through a diagram in which time is already represented is simply wrong. The diagram shows all these universes at all times. They do not move anywhere.
Change: Time flow exists only in connection with causes and effects. Change: one part of space-time can change another as little as one part of a solid three-dimensional object can change another part of that same object. ((s) So no cause and effect?)
Moment: it is pointless to say that one moment after the other has been "laid down". That would be the flow of time. So we see that space-time itself is incompatible with the existence of cause and effect (see above: e.g. puzzle)._____________Explanation of symbols: Roman numerals indicate the source, arabic numerals indicate the page number. The corresponding books are indicated on the right hand side. ((s)…): Comment by the sender of the contribution. Translations: Dictionary of Arguments The note [Concept/Author], [Author1]Vs[Author2] or [Author]Vs[term] resp. "problem:"/"solution:", "old:"/"new:" and "thesis:" is an addition from the Dictionary of Arguments. If a German edition is specified, the page numbers refer to this edition.
Fabric of Reality, Harmondsworth 1997
Die Physik der Welterkenntnis München 2000