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A sphere as a surface which contains many circles II |
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| Authors: | Nobuko Takeuchi |
| Affiliation: | (1) Department of Mathematics, Tokyo Metropolitan University, Setagaya, 158 Tokyo, Japan |
| Abstract: | A sphereM inE3 is characterized as a simply connected complete smooth surface which contains a circle through each pointp  M contained in a normal plane ofM atp.The author would like to thank Professor K. Ogiue for his valuable suggestions. |
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