propan-1-ol
2019-2-27 23:02:49
係,我應該打separable space
:^(
夢追人
2019-2-27 23:12:13
:^(
propan-1-ol
2019-2-27 23:31:22
我都係睇functional入面話A Hilbert space is separable if and only if it has a countable orthonormal basis,先明少少
但一諗返個時topology講separable,second countability完全唔知做緊乜