http://news.mitbbs.cn/article_t/Quant/31186579.html
发信人: GGSS (hoping), 信区: Quant
标 题: a problem
发信站: BBS 未名空间站 (Fri Oct 17 09:02:31 2008)
N people walk on a one-direction road. Let Xi be the speed for ith people,
where Xi independently, identically follows some distribution f(x). If Xi>
Xj, then i will catch up j and keep the same speed as j, so they will crowd
together. The question is what is the expected number of people crowd
tighter after a long time.
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