THEOREM 7.1. A monotonic sequence converges if and only if it is bounded.
定理7.1。如果一个数列单调并且有界，这个数列才能收敛。
A sequence is called monotonic if it is increasing or if it is decreasing.
如果一个序列呈递增或递减变化，我们都可以称其为单调变化。
A sequence is called monotonic if it is increasing or if it is decreasing.
如果一个序列呈递增或递减变化，我们都可以称其为单调变化。
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