[數撚圍爐區] Let ε < 0. (9)

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

其實separable set個separable係咩意思，完全唔明點separable法

係，我應該打separable space

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

any sample?

cu 個 msc貴咗好多
不過都想grad咗下年去讀
有無建議俾到小弟

msc in what