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Aug 26, 2015 at 12:36 vote accept Elwood
Aug 26, 2015 at 12:31 comment added Elwood Thanks again! For the record, the most useful published paper is Peetre, Rectification à l’article "Une caractérisation abstraite des opérateurs différentiels", Mathematica Scandinavica 8 (1960), 116-120. The proof given there is different from that of the 1959 paper (and is attributed to M. Carleson).
Aug 26, 2015 at 6:48 comment added ifw A short exposition of Peetre's result together with references can be found here.
Aug 26, 2015 at 2:11 comment added Elwood Thanks for the answer. I didn't manage to find the result of Peetre you mention. Which theorem of which paper should I be looking at? Besides, I'm not familiar with sheaves. Is there a more accessible proof somewhere?
Aug 25, 2015 at 21:15 history answered ifw CC BY-SA 3.0