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when toggle format what by license comment
Dec 16, 2011 at 13:46 comment added David E Speyer Good catch! Fixed now.
Dec 16, 2011 at 13:46 history edited David E Speyer CC BY-SA 3.0
added 8 characters in body
Dec 16, 2011 at 3:05 comment added darij grinberg Nice proof, but I think your $X_k$ is Igor's $X_{k+1}$.
Dec 16, 2011 at 2:57 history answered David E Speyer CC BY-SA 3.0