State the Diophantine Approximation Theorem in Section V.3 on p.153( restate it if it is stated in the previous lecture), and continue through to the end of the section, which gives a sketch of the proof.

• 大略证明是重要的，这是因为一旦开始就容易迷失在证明的细节?A所以我们要记住真正的目的。