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Here'sa good explanation by Paul Hewitt:
https://www.youtube.com/watch?v=6fSf0lfRLKY
SM
On Sun, Jan 24, 2016 at 12:04 PM, Savinainen Antti <
antti.savinainen@kuopio.fi> wrote:
Hi,
I was asked the question in the title some time ago. I answered that I
really don't know (I suggested a possible explanation which turned out to
be false). The student suggested a YouTube video by prof. Merrifield:
<https://www.youtube.com/watch?v=CiHN0ZWE5bk>