Frerick, Leonhard; Arne Jakobs; Jorda Mora, Enrique; Wengenroth, Jochen(Elsevier, 2020-09-01)
[EN] For a compact set K subset of R-d we characterize the existence of a linear extension operator E: E(K) -> C-infinity (R-d) for the space of Whitney jets E(K) with a certain loss of derivatives sigma, that is, the ...