(In reply to
re(3): Part I  notation by Richard)
This really is not an elementary problem, Richard.
Paul Monsky's solution^{1}, in his own words, "is the only known approach, and it uses valuation theory, and the theorem of the extension of valuationsa mathematician will probably encounter these for the first time as a graduate student."
^{1}American Mathematical Monthly 77:2(February 1970, 161164)

Posted by Mindrod
on 20060204 20:14:26 