Hi Stephen,

Can atoms exist in a 2D universe?

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`I remember having read that 17 sort of atoms can exist in some natural`

`2-dimensional QM.`

`I don't know if this is related to the anyons and Hall effects where`

`particles are squeezed in two dimensional trap (by powerful magnetic`

`field).`

`I have independent reason that the 2-dim topological space (and 2 + 1)`

`continuous deformation are quite important in fundamental physics. But`

`this has not yet been extracted from comp (to be sure).`

AFAIK, physics is very different when constrained to only 2D. My pointis that the notion of computation is meaningless if there is nopossibility of a stable structure on and in which to implement thecomputation.

`This is false imo. A computation can be given a sense in pure`

`arithmetic (if only by Godel's arithmetization device).`

`If you postulate a physical universe at the start, you need to`

`postulate some ad-hoc highly non comp thesis to attach the first person`

`to it.`

Platonic Numbers or bit-strings have no ability to do anything bythemselves (by definition!)

`But numbers can do things by themselves relatively to other (universal)`

`numbers. That is what computer science is all about, I think.`

and thus appeals to their existence are vacuous.

? Best regards, Bruno http://iridia.ulb.ac.be/~marchal/