Dear colleagues,
Many thanks for all your replies. I've printed them all off and will give
them to the student who asked the original question. I'm relieved to be
able to do this because the question came at the end of a heated
discussion and when no one could answer the question, the questioner
thumped her fist on the table and announced to the world in general that
she "needed to know" the answer! I can now prove that I have consulted a
distinguished body of experts from across the world on her behalf!
Ian Wei
University of Bristol
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