[r-t] Practical Extension

Don Morrison dfm at ringing.org
Fri Aug 3 15:49:29 UTC 2018

On Fri, Aug 3, 2018 at 6:31 AM Robin Woolley <robin at robinw.org.uk> wrote:
> (Thought: if you can't do it by hand, how the ... can you write a program
to do it?)

Cf. the four color theorem

Don Morrison <dfm at ringing.org>
“However, as every parent of a small child knows, converting a large
object into small fragments is considerably easier than the reverse
process.”       — Andrew S Tannenbaum, /Computer Networks/
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