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山东大学24级实变函数期末试题个人解答.

山东大学24级实变函数期末试题个人解答.

题目见知乎:

山东大学数学学院2024级实变函数期末考试试题 - MC13113的文章 - 知乎 https://zhuanlan.zhihu.com/p/2055727708919829166

或者

小红书: 山东大学数学学院24级实变函数期末 没有一道送分的题... http://xhslink.com/o/2kSlWftW5h4


试题部分

  1.  是 中的有界 集,. 令. 证明 是可测集, 且.

  2. (1) 若, 证明存在子列, 使得.

    (2) 设, 是 上的可测函数列. 若, a.e. 于, 则对任意, 恒存在 的可测子集, 使 且在 上 一致趋于 (即对任意实数, 总存在, 使得当 时在 上处处有).

  3.  是在 上处处取正值的可积函数, 常数 满足. 记. 证明:

    (注: 本题曾考察 的特例情形, 此处给出原题一般形式)

  4. (1) 设 为 中的可测集, 是 上的非负函数. 证明: 是 上的非负可测函数, 当且仅当 的下方图 是 中的可测集. (2) 设 是 中的可测集, 是 上的非负可积函数. 证明:

  5. (1) 设 及 都在 上可积. 若, a.e. 于, 并且, 则对于 的每个可测子集 恒有:

    (2) 设 及 都是 上的非负可积函数. 若 a.e. 于, 并且, 则:

  6. 证明函数

     上绝对连续.


解答部分

第一题

设  是  中的有界  集, . 令 . 证明  是可测集, 且 .

证明. 首先 集指的是 可写成, 其中为开集. 则

我们断言是开集. 事实上, 任取, 则. 由的开性, 存在, 使得. 取开矩形则容易验证, 于是为开集, 进而集, 故可测.

事实上, 置 , 则易见  给出了的同胚, 从而显然为开集, 因为是开集, 而同胚映射将开集映为开集.

下面说明测度.

  1. 半开矩形的情形:若 是一个有界半开矩形, 则 也是半开矩形, 且

  2. 开集的情形:任何有界开集 可以表为可数个半开矩形的无交并:, 于是

  3. 有界 集的情形:因 为有界 集, 存在一列有界开集 使得 且. 由测度的上连续性及(有界),

    同时, 且 也是递减有界开集列, 从而

综上, 可测且.

吐槽. 最烦的就是这种题了...

第二题

(1) 若 , 证明存在子列 , 使得 .

(2) 设  是  上的可测函数列. 若 , a.e. 于 , 则对任意 , 恒存在  的可测子集 , 使  且在  上  一致趋于  (即对任意实数 , 总存在 , 使得当  时在  上处处有 ).

证明.

(1) 我们断言. 事实上, 由Chebyshev不等式, 有

, 从而由Riesz定理即得.

(2)改写Egoroff定理的证明即可.

由于, 且 a.e. 于, 则对任意正整数, 在几乎处处的点 处, 存在 使得当 时. 换言之, 对每个, 令

 是那些对无穷多个 使得 的点集, 由条件知其测度为零. 又因为序列 关于 单调递减(当 增大时, 并集的指标集缩小), 由测度的上连续性得

任给, 对每个正整数, 可取充分大的 使得

 上, 对每个, 当 时,, 从而对所有 有. 现任给正数, 取整数, 并令, 则对任意 及任意, 均有. 依定义, 在 上一致趋于.

注记. 也可置, 对使用Egoroff定理.

第三题

设  是在  上处处取正值的可积函数, 常数  满足 . 记 . 证明:

证明. 谬设, 则存在 中的集合列 使得

我们要由此导出与 的矛盾.

因为, 对每个正整数, 定义

是上升列, 且, 从而. 因此, 固定常数, 存在 使得

对每个,

因此对所有 成立

这与 矛盾.

第四题

(1) 设  为  中的可测集,  是  上的非负函数. 证明:  是  上的非负可测函数, 当且仅当  的下方图  是  中的可测集.

(2) 设  是  中的可测集,  是  上的非负可积函数. 证明:

证明.

(1)证明:首先回忆下方图的定义

分别证明必要性与充分性.

必要性:设是一列简单函数, 且. 不妨将写成

其中两两无交且. 则从而可测. 注意到, 从而可测.

充分性:设 为 中的可测集. 令 为其特征函数, 则 在 上非负可测. 由 Fubini-Tonelli 定理, 函数

 上的可测函数. 对固定的
  • , 则(当)或(当), 其 Lebesgue 测度为
  • , 截面为空集, 积分为.

因此该积分等于( 时). 限制在可测集 上, 即为可测函数.

(2) 由Fubini-Tonelli定理有

第五题

(1) 设  及  都在  上可积. 若 , a.e. 于 , 并且 , 则对于  的每个可测子集  恒有:

(2) 设  及  都是  上的非负可积函数. 若  a.e. 于 , 并且 , 则:

证明.

(1) 对任意可测子集, 由 Fatou 引理, 有

同理, 对补集,

两式相加得到

, 且等于, 证毕.

(2)  令, 则 a.e. 于. 将 分解为正部和负部:

由于 非负, 有

 a.e.. 因为 可积, 由 Lebesgue 控制收敛定理, 得

又已知, 即, 故
于是

第六题

证明函数

在  上绝对连续.

证明.
函数 在 上连续, 且在 上可导, 其导数为

对任意, 有

由于, 积分 收敛; 又 即, 故积分 也收敛. 因此 在 上 Lebesgue 可积.

由微积分基本定理, 若连续函数 几乎处处可导且导数可积, 则 是绝对连续的, 且

从而 在 上绝对连续.

个人水平有限, 如有问题恳请批评指正.

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  1. CONNECT:[ UseTime:0.000544s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000811s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000317s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000483s ]
  6. SELECT * FROM `set` [ RunTime:0.000227s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000561s ]
  8. SELECT * FROM `article` WHERE `id` = 834035 LIMIT 1 [ RunTime:0.000461s ]
  9. UPDATE `article` SET `lasttime` = 1783219467 WHERE `id` = 834035 [ RunTime:0.000896s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000216s ]
  11. SELECT * FROM `article` WHERE `id` < 834035 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000460s ]
  12. SELECT * FROM `article` WHERE `id` > 834035 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001518s ]
  13. SELECT * FROM `article` WHERE `id` < 834035 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014250s ]
  14. SELECT * FROM `article` WHERE `id` < 834035 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011723s ]
  15. SELECT * FROM `article` WHERE `id` < 834035 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009174s ]
0.131939s