> exponents could not be a solution; finally it was shown that
> only a finite
> number of exponents could be a solution and, in particular, only the
> exponents 0, 1 and 2 were valid. The final result used non-trivial
I really must proof-read more carefully before posting. 0 is *not* a valid
exponent. The other two are, though 1 is trivial and it's easy to give an
infinite set of solutions for n=2. The non-trivial bit is proving that
these are the only exponents.
I don't know what I was thinking of! Sorry.
Paul
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