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數(shù)學(xué)瘋子新蟲 (初入文壇)
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[求助]
實變中的主要定理的證明思路基本就是利特伍德說過的3個準則
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實變中的主要定理的證明思路基本就是利特伍德說過的3個準則 請問這三個準則是什么?求解析,謝謝了 |
新蟲 (初入文壇)
鐵桿木蟲 (著名寫手)
帶你飛翔
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1)任一可測集差不多就是開集(至多可數(shù)個開區(qū)間的并)。 2)任一可測函數(shù)差不多就是連續(xù)函數(shù)。(Lusin定理) 3)任一pointwise收斂的可測函數(shù)列差不多就是uniform收斂的。(Egorov定理) Littlewood stated the principles in his 1944 Lectures on the Theory of Functions [1] as: There are three principles, roughly expressible in the following terms: Every (measurable) set is nearly a finite sum of intervals; every function (of class Lλ) is nearly continuous; every convergent sequence of functions is nearly uniformly convergent. The first principle is based on the fact that the inner measure and outer measure are equal for measurable sets, the second is based on Lusin's theorem, and the third is based on Egorov's theorem. |


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