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when toggle format what by license comment
Nov 16, 2016 at 4:47 history edited Hacon CC BY-SA 3.0
typos
Nov 16, 2016 at 4:23 comment added Li Yutong Thank you for your terrific answer!! May be the "$X$" in the fifth and sixth lines should be $\mathcal X$?
Nov 16, 2016 at 4:21 vote accept Li Yutong
Nov 15, 2016 at 18:03 history answered Hacon CC BY-SA 3.0