[r-t] Easter challenge
Alexander Holroyd
holroyd at math.ubc.ca
Mon Apr 13 21:00:08 UTC 2009
Yes, this is one of the graphs here:
http://www.math.ubc.ca/~holroyd/schreier/
Specifically it is this one:
http://www.math.ubc.ca/~holroyd/schreier/graphs-ps/g13245-14523.ps
There are also lots of interesting (and tricky) asymmetric methods that
give the extent in 2 courses to be got from this graph. Red Square Hybrid
Doubles is the only rung one. The others can be seen here:
http://www.math.ubc.ca/~holroyd/tp/tplines3.pdf
http://www.math.ubc.ca/~holroyd/tp/tplines4.pdf
Ander
Philip Saddleton pabs at cantab.net
Sun Apr 12 21:42:44 BST 2009
This is a problem that is small enough to analyse in depth with pencil
and paper (as I did in my hotel room last night). I came up with the
following graph which allows me to find all symmetrical single-hunt
methods whose plain course is the extent.
1A - 1B - 1C
| x | x |
2A - 2B - 2C
| x | |
3A - 3B 3C
| x | |
4A - 4B - 4C
| x | x |
5A - 5B - 5C
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