hi, When I read variation of metric, I bumped into a unfamiliar formulation for me. You can see the formula in my attachment. I can not understand where this comes from. Could you provide me with the proof of that formula????(adsbygoogle = window.adsbygoogle || []).push({});

By the way, you can go to this link to look at from which the attachment is quoted ( http://www.if.nu.ac.th/sites/default/files/bin/BS_chakkrit.pdf ) page 27. Thanks in advance....

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# A Variation of metrics

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