p_i≥0 且 Σp_i=1；期望看平均、方差看波动。
I beg to introduce myself to you as a clerk in the Accounts Department of the Port Trust Office at Madras on a salary…
高斯报出 5050、阿基米德喊着尤里卡跑出浴缸、伽罗瓦在决斗前夜奋笔疾书——这些瞬间都被写进了故事。可它们发生在多长的日常之后？
