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It has an inner surface and an outer surface, the same as a sphere. They didn't say it had an edge.
by glomph 11y ago
It has an inner surface and an outer surface, the same as a sphere. They didn't say it had an edge.
- bambax 11y agoYes, in the video I'm talking about https://www.youtube.com/watch?v=AAsICMPwGPY https://www.youtube.com/watch?v=AAsICMPwGPY he says that a bootle has an edge (~3'40). A sphere does not have an "inner surface", it has just one surface. So does a potato. If you go from sphere to potato to bowl, when does an edge appear and does it have to appear, is my question.
- geon 11y agoWell. A bottle is topologically equivalent to a solid sphere. It only has one surface. The inside and outside of a bottle is just by convention. Usually you would say something is inside the bottle if it is past the opening. (As he says in the video.) So your example with the bowl-shaped "sphere" is correct. There's no clear limit when a bottle has an inside and an outside.