Fefferman and his coauthors have also worked on Sobolev extension problems (in Sobolev spaces with more than one degree of regularity), see e.g. http://www.ams.org/journals/jams/2014-27-01/S0894-0347-2013-00763-8/home.html . So presumably there is a relationship between the two extension problems, though I have not studied these works in detail.

]]>When you attend talks….do you in general take notes? Is this a good practice?

Thanks

]]>Thanks for the post and for your great blog!

I noticed some typos :

1. In the first equation which is not inline (the norm of F) you want j to play some role in the RHS.

2. Two sentences above the last QUESTION, F should be f and the inclusion should hold for all x in E.

Perhaps the typos are in my head, if so I apologize. ]]>