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Apr 13, 2017 at 12:19 history edited CommunityBot
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Jun 26, 2013 at 18:04 comment added AlexE Another reference which proves this (for self-adjoint, elliptic operators of positive order) is Theorem III.§5.8 in the book "Spin Geometry" by Lawson and Michelsohn.
Mar 13, 2013 at 18:43 vote accept michael faber
Mar 12, 2013 at 10:59 answer added user80744 timeline score: 16
Mar 10, 2013 at 12:30 history asked michael faber CC BY-SA 3.0