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СЕМИНАРЫ |
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Piercing Spheres and the General Schoenflies Theorem Ф. Н. Каддаж |
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Аннотация: An embedded Is a Such a segment, if it exists, is called piercing. The answer was found out to be negative by Bing. However if one adds certain continuity conditions on the piercing segments, for example, that they form a bicollar around the sphere, then the answer changes and becomes a special case of the general Schoenflies Theorem (Mazur, Brown). In fact it is possible to say a bit more for If This remarkable result was built up through the independent methods of Cantrell, Chernavsky and Kirby. Zoom link: https://mi-ras-ru.zoom.us/j/95004507525 Access code: the Euler characteristic of the wedge of two circles (the password is not the specified phrase but the number that it determines)
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