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Uniform Bounds for the Best Sobolev Trace Constant

Abstract We study the Sobolev trace embedding W1,p(Ω) ↪ Lq(∂Ω), looking at the dependence of the best constant and the extremals on p and q. We prove that there exists a uniform bound (independent of (p, q)) for the best constant if and only if (p, q) lies far from (N, ∞). Also we study some limit cases, q = ∞ with p > N or p = ∞ with 1 ≤ q ≤ ∞.