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GTM52习题选做(1)

GTM52习题选做(1)
这个系列我希望可以持续更新,一方面分享一些我的思考,另一方面希望可以敦促我学习——我希望大四这一年我可以读完这本书,并且尽可能多地做书后的习题。众所周知,52的习题是被几代代数几何学家所推崇的。
由于各种原因,我的笔记会手写,发在公众号中的是AI识别我手写笔记整理的结果,我在笔记中常常会中英混杂,在豆包翻译之后可能会有些别扭,勿怪。

Exercise 2.3.7

题目

设  为整概形, 是支配、一般有限的有限型态射。 证明:存在  的稠密开子集 ,使得诱导态射  是有限态射。


证明

设  为  的泛点, 为  的泛点。由  是支配态射,立得 

1. 函数域扩张的有限性

整概形的函数域即为泛点处的局部环,因此  诱导函数域的包含关系

我们先依据Hint证明域扩张  是有限的。

取非空仿射开子集 ,再取非空仿射开子集 。 由于  是整概形, 均为整环。由习题3.6的结论,

支配性意味着环同态  是单射,因此可将  视为  的子环。

令 ,则泛纤维在  中的部分为基变换

由  是一般有限态射,泛纤维  只有有限个点;而  是  的开子概形,因此也只有有限个点。

另一方面,由于  是有限型态射, 是有限生成 -代数,故  是有限生成 -代数,且仍为整环。 只有有限个点,说明  是零维环;零维整环必为域,因此

由此  是域  上的有限生成代数。由 Zariski 引理 是  的有限域扩张。

特别地,对  中任意一点的仿射邻域应用上述论证,可知  仅由泛点  一个点构成。

2. 构造稠密开集 

取仿射开子集 ,满足 。 由第一步的结论,,且对  有 

由于  是有限型态射, 是有限生成 -代数,设

每个生成元  都是  中的元素,而  是有限扩张,故每个  在  上都是代数的。 对每个 ,取首一多项式方程

将所有系数通分,存在非零元 ,使得所有  都属于局部化环 。 因此每个  在  上都是整元,从而

是有限 -模。

接下来收缩开集,使得原像完全落在  中。令

由于  包含了整个泛纤维 ,故 

 是有限型态射,故  是拟紧的; 是开集,因此  是  的闭子集,从而也是拟紧的。 用有限个仿射开子集  覆盖 ,在每个  中,闭子集  对应理想 ,即 

条件  等价于

即存在  使得 。令

则 ,即

最后令 ,取开集 。 由于  是整环且  是  的非空开子集,而整概形的非空开集都是稠密的,故  是稠密开集。

此时

因此

由于  是有限 -模,局部化后  仍是有限 -模,故诱导态射

是有限态射。

综上,存在稠密开子集 ,使得  为有限态射。

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-07-10 21:42:21 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/850126.html
  2. 运行时间 : 0.233808s [ 吞吐率:4.28req/s ] 内存消耗:4,616.72kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=9b2c3f630fd0735545eaab4de09fa09e
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  1. CONNECT:[ UseTime:0.001207s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001969s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000781s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000733s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001774s ]
  6. SELECT * FROM `set` [ RunTime:0.006203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001627s ]
  8. SELECT * FROM `article` WHERE `id` = 850126 LIMIT 1 [ RunTime:0.002591s ]
  9. UPDATE `article` SET `lasttime` = 1783690941 WHERE `id` = 850126 [ RunTime:0.034677s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000882s ]
  11. SELECT * FROM `article` WHERE `id` < 850126 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001199s ]
  12. SELECT * FROM `article` WHERE `id` > 850126 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007920s ]
  13. SELECT * FROM `article` WHERE `id` < 850126 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005250s ]
  14. SELECT * FROM `article` WHERE `id` < 850126 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002061s ]
  15. SELECT * FROM `article` WHERE `id` < 850126 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001956s ]
0.235591s