Update 2012-09-09-persi-diaconis2.md (#478)
Update 2012-09-09-persi-diaconis2.md (#478)

* Update 2012-09-09-persi-diaconis2.md

* Update 2012-09-09-persi-diaconis2.md

hetong007/cosx.org,hetong007/cosx.org,yixuan/cosx.org,fyears/cosx.org,tomatoiscoding/cosx.org,tomatoiscoding/cosx.org,yixuan/cosx.org,fyears/cosx.org,Lchiffon/cosx.org,Lchiffon/cosx.org,cosname/cosx.org,hetong007/cosx.org,cosname/cosx.org,tomatoiscoding/cosx.org,JianqiaoWang/cosx.org,JianqiaoWang/cosx.org,yixuan/cosx.org,fyears/cosx.org,cosname/cosx.org,JianqiaoWang/cosx.org,Lchiffon/cosx.org