作者查詢 / WINDHEAD
作者 WINDHEAD 在 PTT [ Math ] 看板的留言(推文), 共557則
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1F推:感覺你被那老師唬了,平行線的歷史意義並不是有沒有11/18 14:53
2F→:相交而已。真正重要的問題是:為什麼要用定義的11/18 14:54
3F→:為什麼不是用其他公理公設來「證明」或「否證」?11/18 14:56
6F推:沒問題11/08 08:06
3F→:數學系的說話方法是「在某個前提下,積分不存在」10/18 01:25
4F→:或是「在某個意義下,積分存在」。數學系只是比較10/18 01:27
5F→:在乎「那個前提怎麼保證邏輯上可以做到想做的事」10/18 01:27
6F→:廣義函數不只是補洞而已10/18 01:29
7F→:在描述波前,奇異點傳播的時候都是很重要的背景工具10/18 01:34
8F→:也可以應用在GPS信號的演算法上10/18 01:36
5F→:樓上李代數神人要不要順手分享一下 E_8 XDDD09/13 09:53
7F→:數獨的排列組合更多你怎麼不用數獨來卜卦XD09/11 01:28
8F→:我想大部分的數學家都不會認為易經有什麼值得研究的09/11 01:29
9F→:部分, 萊布尼茲提到易經的原因也不是為了探討數學09/11 01:29
10F→:而是說, 既然易經八卦可以用二進制的語言來表述, 那09/11 01:31
11F→:麼中國文化與歐洲基督教文明是不衝突的, 所以我們09/11 01:33
12F→:派傳教士去可以讓更多中國人成為上帝的子民這樣XD09/11 01:33
5F→:取了cohmology之後才能用ext來描述, 更多的資訊是09/08 07:35
6F→:來自於那個 cochain 本身...09/08 07:36
3F→:多謝補充09/08 00:01
8F→:真正的高手出現了09/08 09:37
1F→:你最後一段想表達什麼?看不是很懂09/07 22:16
8F→:其實數學本來就是符號遊戲阿 有什麼好不滿的09/07 22:30
12F→:但其實也沒有你講的那麼trivial,你只在集合論裡面看09/07 22:43
13F→:就只是搬來搬去,但考慮更多結構的話就遠遠沒那簡單09/07 22:44
14F→:你怎麼判斷誰是數學本行的?09/07 22:59
15F→:我意思是在網路上怎麼看誰是數學本行阿XD09/08 02:28
2F推:我想他第一個例子想說的是二維向量,g跟G都normalized07/14 23:19
3F→:推廣之後也要取單位向量在H裡面,就變成把I分解成07/14 23:20
4F→:不同子空間對應的正交投影矩陣這樣07/14 23:20
4F→:e^{iπ}一旦被定義成一個複數,他就必須是 -107/14 11:50