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Answers for “使用下确界如何改变递增序列的收敛准则?”

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The Monotone Convergence Theorem states that if a sequence (an)n∈N(a_n)_{n\in\mathbb{N}} is monotonically decreasing (i.e., an+1≤ana_{n+1} \le a_n for all nn) and bounded from below, then the sequence is convergent. This is a direct application of the existence of the infimum for bounded sets.

Conditions: The sequence (an)(a_n) is monotonically decreasing.; The sequence (an)(a_n) is bounded from below.