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Lower bounds on the norms of extension operators for Lipschitz domains

Lower bounds on the norms of extension operators for Lipschitz domains

Let Ω ⊂ R d be a bounded or an unbounded Lipschitz domain.In this note we address the problem of continuation of functions from the Sobolev space H 1 (Ω) up to functions in the Sobolev space H 1 (R d ) via a linear operator.The minimal possible norm of …