何连生《棋王》里的棋王

要知道，人吃饭，不但是肚子的需要，而且是一种精神需要，不知道下一顿在什么地方，人就特别想到吃，而且，饿得快。一天不吃，棋路就乱。

Sharp Bounds for Symmetric and Asymmetric Diophantine Approximation

In 2004,Tong found bounds for the approximation quality of a regular continued fraction convergent to a rational number,expressed in bounds for both the previous and next approximation.The authors sharpen his results with a geometric method and give both sharp upper and lower bounds.The asymptotic frequencies that these bounds occur are also calculated.