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when toggle format what by license comment
Jun 3, 2011 at 17:11 comment added Michael Renardy I have edited it accordingly.
Jun 3, 2011 at 17:11 history edited Michael Renardy CC BY-SA 3.0
added 2 characters in body
Jun 3, 2011 at 16:11 comment added Julian Newman Many thanks for the answer. I presume the first two subscript i are meant to be a fixed number, and the second two are meant to be what you sum over.
Jun 3, 2011 at 16:08 vote accept Julian Newman
Jun 3, 2011 at 15:21 history answered Michael Renardy CC BY-SA 3.0