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发帖数: 176 | 1 如题， 还有求一个a closed bounded subset of l^2 which is not compact.
Many thanks! | x******a
发帖数: 6336 | | f******n
发帖数: 176 | 3 Thanks, it is an example of not compact, but how about a totally bounded set
in l^2? | x******a
发帖数: 6336 | 4 随便取一个点就是了吧？
想要非平凡的，可以取 {(x_1,x_2, ...): x_1<1, x_2<1/2，x_3<1/3...}. |
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