Markov Chain

好久没更新空间。怎么着也该涂几笔吧。对MSN空间还是很有爱的，至少大过鱼龙混杂的校内。

爱情空间内的随机漫步：哪怕回归时间的期望是永远，但我知道，你一定会回到我身边。

Random walk
in love space, with all recurrent states (with return probability one) but not
positive recurrent states (expected return time is not finite)