作者查詢 / realtemper
作者 realtemper 在 PTT [ Math ] 看板的留言(推文), 共40則
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1F→:好久沒看到值得出手的國中題了 ( ￣ c￣)y▂ξ03/17 17:35
7F→:這我當然曉得：廣義特徵向量跟特徵向量一起構成全空02/12 23:33
8F→:間的basis。但是為什麼一定要找廣義特徵向量？02/12 23:34
9F→:而不能是其他跟特徵向量線性獨立的任意向量？02/12 23:35
10F→:反正只要能夠生成全空間就好了....02/12 23:35
17F→:謝謝樓上....看來是要懂代數才能理解了02/14 22:54
2F推:手機怎麼做到的！這真的夭壽XD02/11 20:29
14F推:推l大 原來如此XD01/31 15:51
8F推:rdθ是弧長ds在切線方向上的投影01/31 23:31
9F→:要連計算法線(半徑)方向上的投影(即dr)一起01/31 23:32
10F→:平方相加開根號 才是長度元素ds。01/31 23:33
8F推:水～09/16 00:24
4F推:定義branch cut就變單值＆解析～04/13 17:44
5F→:最近剛好做過一個例題 #1FU94Fb9 可參考一下04/13 17:44
6F→:wiki資料 http://0rz.tw/GztKy04/13 17:45
7F推:（一樓是要表達什麼？）04/13 17:48
1F推:this is crazy...第一次知道要用power set去構造2^n04/12 02:30
2F→:神人出手果然不一樣啊～04/12 02:31
3F→:借轉 謝謝!04/13 18:43
3F→:推一下萬能代換 XD 未必快速但具有一般性~04/02 23:29
6F推:複變的ln是多值函數 定義cut line才會變單值04/02 16:18
8F推:要用複變算喔！有點複雜 我用手寫scan請稍等04/02 20:09
10F推:http://imgur.com/UwU4n done!04/02 22:06
12F推:註:計算 z=-b 的residue要仍往上繞半圈(圖中省略)04/02 22:10
13F→:所以有2πi。但如果在實軸上 就視同實變積分無此問題04/02 22:11
15F推:沒錯～複變碰到ln都要特別小心cut的問題！04/02 23:24
16F→:這類陷阱中一次 就會知道cut是幹甚麼用的 XD04/02 23:26
20F→:我覺得重點是不能跨過cut line耶 不管有無奇異點~04/03 01:42
21F→:雖說ln(0)是奇異點 可是residue=0並不影響計算結果04/03 01:43
22F→:所以關鍵並非是否包到奇點 而是不能跨過cut line04/03 01:45
23F→:（我不曉得有沒有允許跨過去的算法 只知避開為妙！）04/03 01:48