唔係好肯定"chok下d level set, 2 variables如果有兩條curve相交"實際係點,有冇 concrete example
propan-1-ol2019-02-27 22:15:58
其實separable set個separable係咩意思,完全唔明點separable法
夢追人2019-02-27 22:49:20
propan-1-ol2019-02-27 23:02:49
係,我應該打separable space
夢追人2019-02-27 23:12:13
propan-1-ol2019-02-27 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