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Answers for “应用控制收敛定理需要哪三个假设条件?”

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The three hypotheses are: (1) a sequence of functions fnf_n converges to a function ff on the interval [a,b][a,b]; (2) there exists a dominating function gg such that ∣g(x)∣≥∣fn(x)∣|g(x)| \ge |f_n(x)| for all nn and all x∈[a,b]x \in [a,b]; and (3) the integral of the dominating function over the interval is finite, meaning ∫abg(x) dx<∞\int_a^b g(x)\,dx < \infty.

Conditions: The theorem is presented in a calculus-oriented form rather than a full measure-theoretic proof.; The interval [a,b][a,b] is a closed, bounded real interval.