[腦力大挑戰] Mathematical analysis BB班

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639 Like 19 Dislike
2018-04-11 02:44:09
明明 density theorem + existence of \sqrt{2} 易明好多
2018-04-11 02:47:14
density theorem唔係喺後面咩
2018-04-11 02:52:36
講左先無壞
2018-04-11 02:55:07
我成日都話rudin寫得好unfrie3ndly, 係唔知點解堆天才成日覺得佢好好
2018-04-11 03:36:40
就嚟1001
開始感覺到開新post嘅壓力
2018-04-11 04:11:04
你唔係話有佢架咩
2018-04-11 07:34:33
rudin本身太勁同諗野好efficient但又好fundamental,所以佢啲書差唔多下下都處理最general嗰個setting(經典咪就係rudin theorem 2.10 "riesz representation theorem",差唔多本本書講得呢個theorem都會refer番rudin,叫人睇佢個proof算 ),而且重係用最compact既方法做 你可以講係佢嘅style係咁,不過我就係鍾意咁所以我覺得佢啲書好好睇
重有更經典嘅係佢個ch.2 Q.8, 佢用左半頁article就做左
http://www.jstor.org/stable/2975692
不過你試下睇佢個proof就會一樣好似上面咁既反應,佢嗰幾舊野其實點諗到
2018-04-11 08:23:35
我覺得 real and complex (唔做d exercise) 好過 baby rudin
baby rudin 無學過 analysis 真係唔知佢搞緊乜
可能我只係一個庸才
2018-04-11 08:42:38
我啲analysis基本功其實係由bartle而嚟 講真pma我都冇詳睇(因為基本野其實你讀一本就得其他做參考就算),所以我對pma都冇好感
而其實我感覺都係rudin好過baby rudin,因為rudin嗰種style寫advanced野好啲
2018-04-11 08:52:30
bartle真係好正, 不過有班茂利話佢垃圾, 嫌太淺

我都暫時搵唔到一本可以 stand out 的measure theory書, 我睇過的每本都有明顯的缺陷
2018-05-01 19:53:34
Generalize R^n 嘅 concept 去所有 vector space,令到一啲喺 R^n 嘅 proof (只需要用到嗰堆 rules 嘅 proof) 可以用喺所有 vector space。
2018-05-01 22:09:56
vector space有個linear structure, 即係物件相加或者乘個數字可以做成一個新嘅物件, 而且呢兩個運算要附合一堆合理規則, 即係10條vector space axioms

linear transformation就係vector space同vector space之間, 可以保持住呢種linear structue嘅function

linear algebra主要就係學點樣理解vector space同linear transformation

好多唔同數學範疇都會出現vector space, 所以linear algebra係讀數學嘅一個基礎
2018-05-01 23:10:13
最常見/最基礎嗰啲應該都係你讀linear algebra嗰時已經見唔少
e.g. R^n, C^n, space of continuous functions on [a,b], space of continuously differentiable functions on [a,b], space of polynomials, space of polynomial of degree at most n etc.
其他唔同area會常見嘅vector space又唔一樣
例如
differential equations: 一條linear homogeneous equation嘅solution space
analysis: space of integrable functions on [a,b]
其他就唔詳細列了

唔常見例子:
On set of elements in R^2, define
(x,y) "+" (z,w) = (x+z, y+w+1)
a "‧" (x,y) = (ax, ay+a-1)
咁樣都會define到個vector space
2018-05-01 23:31:03
Key word: functional analysis (可以話用analysis角度睇linear algebra, 呢度會明infinite dim d 性質同F^n 有幾唔同)

係algebra都會見到,module係fancy版linear algebra, d coefficient唔一定係RCQ呢d fields, 可以係matrices, integers, etc.
2018-05-01 23:55:45
濕鳩course
2018-05-02 14:58:10
比kin li 屠殺完而家好掛住佢
btw出年ust fall sem新開math analysis
好期待新版本
2018-05-02 15:04:05
咩新版本
2018-05-02 15:13:25
唔係kin li 教既新版本
fall sem not kin li
2018-05-02 15:14:32
邊個教
2018-05-02 16:37:26
有冇人慢慢發覺其實唔明數學問人係冇撚用?
問人可能會識做一兩題數,但一啲數學概念真係只可以自己坐低諗掂佢
2018-05-02 16:42:43
有d technuque無人教你一世都唔識
2018-05-02 16:46:35
有冇人慢慢發覺其實唔明數學問人係冇撚用?
問人可能會識做一兩題數,但一啲數學概念真係只可以自己坐低諗掂佢
有d technuque無人教你一世都唔識

我同意呀,但比如lin alg 一啲concept 嘅meaning 其實真係要靠自己諗通,當年我第一次見到eigenvalue 都唔知做乜鳩,淨係識計,但呢啲都係要自己慢慢明白
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