[r-t] Principles

Alexander Holroyd holroyd at math.ubc.ca
Tue Jul 5 21:39:09 UTC 2011

These symmetry issues are indeed most intriguing...

On Tue, 5 Jul 2011, Matthew Frye wrote:

> On 5 Jul 2011, at 22:07, Alexander Holroyd wrote:
>> -123458-1238-1678-145678

> Further questions: is a similar construction possible in the presence of 
> other symmetries? I think we've already ruled most out, but glide 
> symmetry perhaps? What about no symmetry other than translational?

Really?  You mean you can prove that ordinary (palindromic) symmetry is 
impossible, for example?


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