Geodesic
Rellich′s Embedding Theorem for a “Spiny Urchin”
Canadian mathematical bulletin, Tome 10 (1967) no. 5, pp. 731-734

Voir la notice de l'article provenant de la source Cambridge University Press

From the plane R2 we remove the union of the sets Sk (k = 1, 2, ...) defined as follows (using the notation z = x + iy):Sk = {z: arg z = nπ2-k for some integer n; |z|≥k}.The remaining connected open set Ω we call the spiny urchin. 
Clark, Colin. Rellich′s Embedding Theorem for a “Spiny Urchin”. Canadian mathematical bulletin, Tome 10 (1967) no. 5, pp. 731-734. doi: 10.4153/CMB-1967-075-6
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[1] 1. Clark, C., An embedding theorem for function spaces. Pacific J. Math. 19 (1966), Z43-251. Google Scholar

[2] 2. Clark, C., Some embedding theorems for Sobolev spaces defined over unbounded domains, (to appear). Google Scholar

[3] 3. Rellich, F., EinSatz liber mittlere Konvergenz, Gottinger Nachr. (1933), 30-35. Google Scholar

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