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

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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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     author = {Clark, Colin},
     title = {Rellich's {Embedding} {Theorem} for a {{\textquotedblleft}Spiny} {Urchin{\textquotedblright}}},
     journal = {Canadian mathematical bulletin},
     pages = {731--734},
     year = {1967},
     volume = {10},
     number = {5},
     doi = {10.4153/CMB-1967-075-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1967-075-6/}
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