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May 5, 2011 at 22:40 comment added Ryan Budney $2 - \chi$ is a widely accepted name.
May 5, 2011 at 22:14 comment added Tony Huynh I am using the notation $2- \chi$ for it, but am just wondering if it has a widely accepted name.
May 5, 2011 at 22:07 comment added Simon Rose @Mark - Yeah, that's sort of what I was getting at.
May 5, 2011 at 21:48 comment added Mark Grant Indeed. So why not just call it $2-\chi$?
May 5, 2011 at 21:02 comment added Tony Huynh Indeed. This is another reason why this is the more natural definition, among others.
May 5, 2011 at 20:57 history answered Simon Rose CC BY-SA 3.0