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Is there a new proof? Or it is just trivial?

gilliatt
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  • Are you looking for a heuristic reason why you should believe $G \in C^2$, or a full rigorous proof of the fact? – Tom Nov 13 '13 at 01:07
  • Why G \in C^2? And I wonder whether Rudin's proof is ture. I cheek the rudin's proof about Poincaré Lemma.I found it seem have a mistake. Through Google,I found another guy else has ever noted such an erro. More detail,http://mathforum.org/kb/thread.jspa?forumID=13&threadID=2141549&messageID=7208112 – gilliatt Nov 13 '13 at 09:21

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